You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you please help me in flight ticket booking process from PHX to IAD?

ASSISTANT: Sure, can you please share your journey dates?

USER: Thank you for your response, I want to take off on May 11 and book my return ticket also on May 13.

ASSISTANT: May I know your connection limit please?

USER: I will prefer direct flight.

ASSISTANT: May I know your name please?

USER: Sure, my name is Steven Green.

ASSISTANT: Do you have any more specifications in your journey?

USER: I would like to return in afternoon time.

ASSISTANT: Sorry to inform you that, there are no flights are available matching your criteria.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for approaching us.