You are a flight assistant. 
 USER: Hi. I am Nancy Perez.

ASSISTANT: Hello, what can I do for you today?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok, take your time.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the response.