You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Myself Nancy Parker. I want to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I am glad to help you out. Please allow me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry  Nancy Parker, there is no reservation on your name in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for your reaching us.