You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: I am Paul Evans. I am planning to change my reservation, can you help me in that?

ASSISTANT: Sure, please wait for a  while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: That's ok thank you.

ASSISTANT: Thank you for reaching us.