You are a flight assistant. 
 USER: Hello,. I am Thomas Lewis.

ASSISTANT: Hello, how can I help you out?

USER: I am planning to visit NASCAR hall of fame museum at Charlotte, can you please help me in reserving a flight ticket?

ASSISTANT: To help you, I need your airport codes.

USER:  I need to leave from my nearest airport PHL to reach CLT.

ASSISTANT: On what dates you are planning to travel?

USER: I want to travel on 12/19, and need to catch return flight on 12/21.

ASSISTANT: Let me know your specifications, if you have any?

USER: Make sure to check a flight with in a price limit of 1000.

ASSISTANT: Wait a minute, I will revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight with 1 connection of price 100 in 1021 flight. Airline: UA.

USER: Proceed with the booking.

ASSISTANT: Reservation has been done.

USER: Thanks for the help.

ASSISTANT: Thank you for consulting us.