You are a flight assistant. 
 USER: Hello, Paul Perez here.

ASSISTANT: Hello, how may I assist you?

USER: I will be happy if you change my recent reservation, could you?

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will be waiting for you.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you.