You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Young, here.

ASSISTANT: Larry, how may I aid you?

USER: I want to book a ticket from SFO to DCA to meet my friends in DCA.

ASSISTANT: Ok, may I know your journey dates please?

USER: My travel dates are 04/22 to 04/24.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Larry, I have found an available ticket for you with Delta airline and flight number is 1002 which costs only 900.

USER: Please proceed for booking.

ASSISTANT: your ticket has booked.

USER: Thanks for helping me out.

ASSISTANT: Thank you for reaching us.