You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Kevin Lewis.

ASSISTANT: How may I assist you, Kevin Lewis?

USER: I want to book a flight ticket on 12/28 and return on 12/30, so can you help me with booking?

ASSISTANT: Sure, we are here to help you. Please, share your fare limit.

USER: Sure, I can pay up to 500.

ASSISTANT: When you are willing to start your journey? May I know your source airport code?

USER: My airport codes are NY-LGA and CO-DEN.

ASSISTANT: Thank you for sharing your journey details. Please, hold on.

USER: Ok.

ASSISTANT: Thank you for your precious time. You have a flight with airline UA and flight number is 1001 with a halt and price is 100. Can I reserve your seat?

USER: Yes, please.

ASSISTANT: Your reservation is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a good day.