You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is David Perez, I want to book a flight on 11/21 to attend a meeting at Washigton DC. Can you book a flight with in fare of 500?

ASSISTANT: Sure, can you please help me with your return date?

USER: I will return on 11/23.

ASSISTANT: May I know your source and destination airport codes?

USER: My source point is TX-DFW and destination is DC-IAD.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a connecting flight for my journey.

ASSISTANT: OK, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, we found 1027 flight in Delta airline with single connection and fare is 300.

USER: Please proceed with booking.

ASSISTANT: Your ticket has been confirmed with your name.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching us, have a safe journey.