You are a flight assistant. 
 USER: Hi, I am Sharon Brown.

ASSISTANT: Hello, how may I aid you today?

USER: My Christmas celebration location is changed from one place to another.

ASSISTANT: Ok.

USER: Can you help in change in existing reservation?

ASSISTANT: Sure, please wait a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Thank You.

ASSISTANT: Thanks for choosing us. Have a nice day.