You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to travel from IAD to JFK. Can you help me to book a flight ticket?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: I want to travel in the flight on Feb 07 and Feb 09.

ASSISTANT: May I know your depart and return timings?

USER: I want to return in evening time.

ASSISTANT: May I know your good name?

USER: Margaret Walker.

ASSISTANT: Please wait for a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there are no flights found based on your journey dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for approaching us.