You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am George Taylor. I want to change my existing reservation due to postpone of my exams, so can you please help me with this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a reservation on your name, can you please provide your new journey dates?

USER: My new journey dates are Dec 12 and Dec 14.

ASSISTANT: Kindly assign your airport codes?

USER: My journey airport codes are CLT and LAX.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Can you please mention your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any more preferences?

USER: I want to return in the morning.

ASSISTANT: We found a Frontier airlines, flight number 1020, price is 100 in economy class, your return flight time is 4:00 AM. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Your reservation has been changed.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.