You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Due to some personal problems, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, I am happy to  help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check your reservation status?

USER: My name is Patricia Moore.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Patricia Moore, no reservation has found under your name to change.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.