You are a flight assistant. 
 USER: Hi. I am Dorothy Anderson.

ASSISTANT: Hello, how can I assist you today?

USER: I want to cancel my reservation as my lab exam got cancelled. Can you help me with cancellation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: It's Ok. Thanks for your response.

ASSISTANT: Thank you for choosing us.