You are a flight assistant. 
 USER: Hello. I am Christine Jones.

ASSISTANT: Hello. How may I guide you today?

USER: I am planing to book a ticket to attend music event at PHX. Can you please help m out  to book a ticket from HOU?

ASSISTANT: Sure, I will help you with that. On which travelling dates that you want to start your trip?

USER: I would like to ravel on 11/21 and return back on 11/23.

ASSISTANT: Wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us.