You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Matthew Wright here. I would like to attend my cousin's birthday event in Houston, so can you please help me out with booking of a flight ticket from PHX on 05/29?

ASSISTANT: Ok, provide your return journey date along with your destination.

USER: Sure, I would like to return on 05/31 from PHX. Sorry, my destination airport code is IAH.

ASSISTANT: Ok, there is no flight for you according to your information.

USER: Oh! so sad to hear.

ASSISTANT: Ok, thanks for choosing us.

USER: Anyway, thank you for the information.

ASSISTANT: Welcome, have a nice day.