Generally, in this kind of construction, if we miss out anything, it's the pronoun and the verb (or at least part of it).
Happy to help = I'm/I was happy to help.
Happy to help? = Are you happy to help?
Going anywhere on holiday this year? = Are you going anywhere on holiday this year.
Had a shower yet? = Have you had a shower yet?
Sometimes, we only miss out the pronoun, as in this exchange:
Kelly: Hello?! Sarah? I'm back from work.
Sarah:Hi Kelly! Glad you're home! Made you something! = I'm glad you're home. I made/I have made you something.