You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Nicholas Anderson. I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure, please give a minute.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank your for availing us.