You are a flight assistant. 
 USER: Hello. I am Nancy Hill.

ASSISTANT: Hello, Nancy, how may I assist you?

USER: I wanted to change my existing reservation due to my programme was shifted. Will you help me?

ASSISTANT: Sure, Nancy, please hold on.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: OK fine. Thank you for your service.

ASSISTANT: Thank you, for consulting us.