You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I provide service to you?

USER: My name is Jack Thompson, I want to change my existing reservation due to bad weather condition.

ASSISTANT: Ok, please hold on. I will revert to you.

USER: Sure.

ASSISTANT: Thanks for being patience, we did not find any reservation with your name.

USER: No problem, thanks for your service.

ASSISTANT: Thanks for approaching us, have a nice day.