You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jerry Jackson. Please help me in booking a flight ticket from PHX to DFW.

ASSISTANT: May I know your desired travel dates please?

USER: I want to take off on May, 28 and return back on May, 30.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: There is a flight with connection limit 1 and fare 100, shall I proceed for booking?

USER: Make sure that my depart time should be at afternoon and my return time should be at morning.

ASSISTANT: Sorry to say, there is no flight available.

USER: It's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information.