You are a flight assistant. 
 USER: Hello. I am Jennifer Lee.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket from PHL to DCA, Can you please help me for booking?

ASSISTANT: Sure, may I know your dates of travel?

USER: I would like to travel on 04/04 to 04/06.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.