You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in changing the reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Nancy Martin.

ASSISTANT: Ok, please wait.

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.