You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How shall I assist you?

USER: I want to book a flight ticket to meet my uncle in Washington, could you help me in booking a flight ticket?

ASSISTANT: Sure. Please provide your travelling codes?

USER: My source is Philadelphia, PA - PHL and destination code is DC - DCA.

ASSISTANT: Please specify travel dates?

USER: I would like to fly on 11/10 and return on 11/12.

ASSISTANT: Connecting flight 1007 is available with airline Spirit, for price 200.

USER: You can proceed to booking.

ASSISTANT: May I know your name?

USER: I am Elizabeth Baker.

ASSISTANT: Ticket is booked.

USER: Thank you for your good service.

ASSISTANT: Thanks. Have a great day!.