You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please assist me in booking a flight ticket from PHX to DFW?

ASSISTANT: Sure, I am here to help you out. May I now your travelling dates please?

USER: I will leave on Sept 20th and will return back on Sept 22nd.

ASSISTANT: Can you please share your airline preferences?

USER: I don't have any airline preference.

ASSISTANT: May I know your name please?

USER: My name is Brian Baker.

ASSISTANT: May I know your connection limit please?

USER: I am fine with one connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in the evening and return back in the afternoon.

ASSISTANT: There are no flights available in your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.