You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Catherine Carter. I would like to change my existing reservation due to rainfall at my place I could not attend my seminar.

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your name.

USER: Ok, no issues at all.

ASSISTANT: Thank you for choosing us. have a great day.

USER: Thank you for your information.