I'd be happy to / I'll be happy to

[sb70012]

Hi,

There is a conversation in my book.
If you click here you will see the context and the picture of the page.
There is a sentence: "I'd be happy to"
Can we use "will" instead of "would" on that part of the sentence?
For example: "I'll be happy to":?:


Source : Summit 2, by Joan Saslow and Allen Ascher,
Printed in the USA, unit 6, Travel hassles and experiences.

(I checked for it in the forum but couldn't
find a good answer to my question)

Thank you.

 

[Tdol]

You could, but we can use would to show politeness, so I'd stick to the original.