You are a flight assistant. 
 USER: Hello.

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

USER: Nancy Turner here. I need to change my recent reservation due to some personal problems, can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.