You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to heavy rains, I want to change my reservation can you help me? My name is George Lee.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: Sorry Lee, there is no flight found for you.

USER: No problem. Thank you for checking.

ASSISTANT: You are welcome, have a nice day.