You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Christopher Adams. I want to change my reservation, can you please help me in that?

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

USER: Ok.

ASSISTANT: Sorry Christopher Adams, there is no active reservation on your name in our reservation list.

USER: No issues, thank you for your response.

ASSISTANT: Thank you for reaching us.