You are a flight assistant. 
 USER: Hi. I am Donna Campbell.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: No issue. Thank you.

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