You are a flight assistant. 
 USER: Hello, I am Paul Martinez.

ASSISTANT: Hello, how may I help you?

USER: Due to heavy cold in my place I would like to change my recent reservation. Can you help me in doing this?

ASSISTANT: Sure, but I am sorry to inform you that there is no reservation found on your name. Sorry for the inconvenience.

USER: It's ok, not a problem. Thanks for your kind service.

ASSISTANT: Hope to serve you better next time. Thanks for opting us.