You are a flight assistant. 
 USER: Hello, I am Andrew Hall.

ASSISTANT: Hello, how can I assist you?

USER: Due to some health issue, I want to cancel my recent reservation. Can you help me for cancellation?

ASSISTANT: Sure, please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no reservation based on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you.