You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER:  I am Jonathan Lee want to attend Auto show at DC-DCA with my friends. Can you book a connecting flight?

ASSISTANT: Sure, to book a flight ticket may I know your source code?

USER: I will depart from TX-DFW.

ASSISTANT: Let me know how much can you spend for flight ticket.

USER: I can spend up to 5000.

ASSISTANT: Could you please mention your travelling dates?

USER: My travelling dates are 06/16 and 06/18.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: There is an airline called Spirit of flight number 1026 and fare is 100. Shall I book it for you?

USER: Ok, you can proceed with booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.