You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: As I am a doctor, I want to attend an emergency case at Dallas & Fort Worth, DFW.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are Dec 9 and Dec 11.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: Sure, my source is Charlotte, CLT.

ASSISTANT: There is a connected flight in Frontier airlines with the fare 200.

USER: Please proceed for booking.

ASSISTANT: Your booking is done. Your flight number is 1002. Thank you.