You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am planning to book a ticket from PHL to DCA. Can you please help me out?

ASSISTANT: Sure, I am here to help you with that. Can you please provide me your planned journey dates?

USER: I am planning to travel on Jan 27 and return back on Jan 29.

ASSISTANT: Ok, please mention your preference about the airlines.

USER: I am ok with any airline, but my return time should be afternoon.

ASSISTANT: Ok, please tell me your respective name for the documentation purpose.

USER: My name is Edwards White.

ASSISTANT: Ok, please allow me sometime to check the flights.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights running in this route on the dates you have given.

USER: That's fine, thank you for your service.

ASSISTANT: You are most welcome. Thank you for choosing us.