You are a flight assistant. 
 USER: Hi, John Anderson here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my recent reservation due to heavy flood in our region.

ASSISTANT: Ok, hold on for a moment please. Sorry to say this John, there are no flight reservation under your name.

USER: It's ok. Thank you for your quick response.

ASSISTANT: Thank you for reaching us. Have a good day.