You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Miller.

ASSISTANT: How can I assist you?

USER: I would like to travel from PHX to HOU, can you help me in booking the flight ticket?

ASSISTANT: Sure Miller, can I know the travel dates please?

USER: My trip dates are from 09/04 till 09/06.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for approaching us.