You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Gregory Campbell. I need to book a flight ticket from NC - CLT to DC - IAD. Could you help me?

ASSISTANT: Sure, we are here to help you in booking. How much fare you are expecting for the flight ticket?

USER: My expecting fare is 200.

ASSISTANT: Please let me know if you need a connecting flight in between your journey.

USER: I need single connecting flight.

ASSISTANT: Kindly mention your planned travelling dates to proceed further.

USER: My planned travel dates are from 11/23 to 11/25.

ASSISTANT: Ok, please wait a moment I will search best flight for you.

USER: OK.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: That's ok, no problem, Thank you for helping me.

ASSISTANT: Thank you for choosing us.