You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Nancy Adams, can you help me for changing my existing reservation?

ASSISTANT: Sure, please wait a moment I will check your reservation details and proceed further.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us, have a nice day.