You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am looking to book a flight ticket from IAD to PHX. Can you help me for that?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travelling dates are Feb 27 and Feb 29.

ASSISTANT: Do you have any connection limits?

USER: I prefer to book a single connecting flight.

ASSISTANT: Any other requirements to be met?

USER: My return time is evening.

ASSISTANT: May I know your good name?

USER: My name is Anna Allen.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.