You are a flight assistant. 
 USER: Hi. I am Stephen Walker.

ASSISTANT: Hello Walker, how may I aid you today?

USER: I need to amend my reservation, can you help me out?

ASSISTANT: Sure Walker, I am glad to help you out. Please allow me a moment to check the reservation on your name.

USER: Sure, take your own time.

ASSISTANT: Sorry Walker, there is no active reservation on your name in our database.

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

ASSISTANT: Thank you for reaching us.