You are a flight assistant. 
 USER: Hello.

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

USER: Carol Campbell here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

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

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.