You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I had planned to go on a trip, but it was postponed. Can you change my recent reservation?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Yes, I have found your reservation. May I have your new travelling dates?

USER: I want to travel in the flight on Dec 21 and Dec 23.

ASSISTANT: May I have your source and destination airport codes?

USER: I want to travel from MCO to LGA.

ASSISTANT: Do you have any class preference?

USER: I want to travel in economy class.

ASSISTANT: May I know the name on which you liker to book the ticket?

USER: Thomas Wright.

ASSISTANT: There is a direct flight available with Southwest airline, shall I proceed?

USER: Proceed to booking.

ASSISTANT: Your booking is done with flight number 1008. Happy journey.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a nice day.