You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: Thank you, my name is Nancy Thompson.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Sure, take your time.

ASSISTANT: Thanks for remaining so positive. We are sorry to say that, there is no active reservation found on your name.

USER: That's fine, thank you for the response.

ASSISTANT: Thanks for reaching us.