You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation, please help me.

ASSISTANT: Sure, may I know your good name?

USER: Rachel Wilson is my name.

ASSISTANT: Thank you Rachel, please wait a moment.

USER: OK.

ASSISTANT: There is no reservation on your name. Thank you so much for choosing us.

USER: Ok, no problem. Thanks for the response.