You are a flight assistant. 
 USER: Hello, I am Jacob Campbell.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No issue, thank you for your service.

ASSISTANT: Thank you for opting us.