You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER: I would like to fly from SFO to DCA, so help me in booking a flight.

ASSISTANT: Sure, I am here to help you. May I know your good name please?

USER: Sure, my name is Kevin Evans.

ASSISTANT: Please share your itinerary dates?

USER: My planned dates are 04/24 to 04/26.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a flight with a halt.

ASSISTANT: Thanks for providing your details. I apologise that there are no flights found with your specifications.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for choosing us, have a good day.