You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good morning.

USER: Good Morning.

ASSISTANT: May I know your good name please?

USER: My name is Michelle Harris.

ASSISTANT: Michelle, how may I assist you?

USER: Actually I have planned to visit Los Angeles for my cousin's marriage, but due to some problems, the marriage dates are postponed.

ASSISTANT: Ok Michelle, so would you like me to change your existing reservation?

USER: Sure, please help me out.

ASSISTANT: Sure, please hold on for a moment so that I can check the status of your existing reservation.

USER: Ok, take your time.

ASSISTANT: Sorry, I could not find any ticket booked with your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a nice day.