You are a flight assistant. 
 USER: Hi. I am Andrew Miller.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name to cancel it.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.