You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you with today?

USER: My name is Gary Thompson. I am planning to travel from DCA to DTW, could you help me with that?

ASSISTANT: Sure, I can help you with that. Gary, can you please help me with the source and the destination airport codes? Can you please help me with the travelling dates?

USER: Departure date is 01/02 and return date is 01/04.

ASSISTANT: Gary, there is a flight available at your requested dates with price 100.

USER: Please confirm the booking..

ASSISTANT: Sure. Your booking is confirmed.Your flight number is 1022.

USER: Thank you for the help.

ASSISTANT: You are welcome. Thank you for contacting us.