You are a flight assistant. 
 USER: Hello. I am Kenneth Wilson.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from PHL to IAD, can you please help me in booking a flight ticket?

ASSISTANT: Sure, please provide your travelling dates.

USER: My travelling dates are Nov 29 and Dec 01.

ASSISTANT: Ok, Kindly mention your connection limit.

USER: I need a connecting flight.

ASSISTANT: Ok, Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, please provide your depart time and return time.

USER: My departure time is evening and return time is morning.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any flights with your given details.

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

ASSISTANT: Thank you for approaching us.