You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, I am here to help you with it.

USER: Thank you for accepting my request.

ASSISTANT: Can you please share me your name?

USER: Myself Larry Lewis.

ASSISTANT: We have found reservation on your name, please share your new airport codes.

USER: My airport codes are SEA and LGA.

ASSISTANT: May I know when are you willing to travel?

USER: My travelling dates are Dec 24 and Dec 26.

ASSISTANT: Do you have any class preference?

USER: No, I don't have any specifications?

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: Please share if your have any other preference.

USER: No, thank you for asking.

ASSISTANT: We have a direct flight from American airlines, number 1000 and it is costing 200. Shall I proceed?

USER: Sure, you can proceed with the booking.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.