You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carol Hill.

ASSISTANT: How can I help you?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: That's ok, thank you.

ASSISTANT: Thanks.