You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from SFO to ATL, can you please assist me in booking a flight ticket?

ASSISTANT: Sure, can I know your travel dates?

USER: I will board the flight from Sept 21st and land back to my source on Sept 23rd.

ASSISTANT: Ok, do you have specific travel timings?

USER: I want to return back in the evening.

ASSISTANT: Do you need a break in your journey?

USER: I am fine with a connecting flight.

ASSISTANT: Any more requirements to be met?

USER: No.

ASSISTANT: May I know your name please?

USER: Sure, my name is Donna Garcia.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: I regret to inform you that there were no flights found  with your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.