You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself Nancy Taylor from Washington. Can you please book a direct flight to Washington?

ASSISTANT: Sure, I will help you with that. May I know your preferable travel dates please?

USER: Thank you, I want to take off on 05/25 and please confirm my return ticket also on 05/27.

ASSISTANT: Can you please provide your source and destination codes?

USER: I would like to take off from IAD airport because this airport is near to my location and destination airport is DCA.

ASSISTANT: I found a flight with connecting flight with price of 200 in Frontier airlines. Can I  proceed with this booking?

USER: That's perfect, please confirm this flight ticket for me.

ASSISTANT: Your booking is confirmed with flight 1023.

USER: Thank you for your help in booking flight ticket.

ASSISTANT: Thank you for approaching us.