Looking on the internet deeply has found these results:

I'm happy to is the most popular phrase on the web.

I'll be happy to 1371,000 results on the web	I'm happy to 13,860,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
The professional, however responds with, �I don't know, but I'll be happy to check. � If you were the customer, which employee would you say provides better�... I'll be happy to meet with you at your convenience. [=at a time that is convenient for you; at a time that will not cause you too much trouble or effort]. Please come�... Mar 14, 2016 ... As in "I'll be happy to help." or "I'd be happy to help." Can we use "I'm glad to help " to refer to the past, that is, you helped you you are happy�... Mar 30, 2008 ... Most everyone else avoids the should/would and shall/will by using 'd and 'll. In spoken English, "I'd/I'll be happy to answer them" is what would�...	I'm happy to be here. Really. I'm happy to see you, too. I'm happy to see you now that we're calm. And I'm happy to watch Mateo. I'm happy to see you, Bruce. I'm happy to see you. I'm happy to pay, of course. I'm happy to see you are devoted to Miss Brodie.

I'll be happy to

1371,000 results on the web

I'm happy to

13,860,000,000 results on the web

More popular!

The professional, however responds with, �I don't know, but I'll be happy to check. � If you were the customer, which employee would you say provides better�...
I'll be happy to meet with you at your convenience. [=at a time that is convenient for you; at a time that will not cause you too much trouble or effort]. Please come�...
Mar 14, 2016 ... As in "I'll be happy to help." or "I'd be happy to help." Can we use "I'm glad to help " to refer to the past, that is, you helped you you are happy�...
Mar 30, 2008 ... Most everyone else avoids the should/would and shall/will by using 'd and 'll. In spoken English, "I'd/I'll be happy to answer them" is what would�...