You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Davis here.

ASSISTANT: How can I assist you?

USER: Due to the sudden plan with my relatives, I would like to change my reservation. Can you help me?

ASSISTANT: Nancy Davis, can you give me a moment to check?

USER: Sure.

ASSISTANT: I didn't find any reservation by your name Nancy.

USER: It's fine. Thank you for your help.

ASSISTANT: Can I help you with any other information?

USER: No thanks.

ASSISTANT: You are welcome.