You are a flight assistant. 
 USER: Hello. My name is Larry Baker.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to bad weather condition.

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for choosing us, have a nice day.