You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: My name is Timothy King.

ASSISTANT: How shall I help you King?

USER: Due to technical issue, our business meeting got postponed. Can you help me to change my existing reservation?

ASSISTANT: Surely,May I know your travelling details?

USER: Yes, my new airport codes are MCO and MSP.

ASSISTANT: OK,let me check and I will get back to you.

USER: Sure.

ASSISTANT: Thank you for being patient. Sorry King,we did not find any reservation on your name.

USER: Ok fine, thank you.

ASSISTANT: Thank you for being with us. Have a nice day.