You are a flight assistant. 
 USER: Hello, Charles Lee here.

ASSISTANT: Hello. How ,may I assist you now?

USER: I want to cancel my recent reservation due to some personal issues, can you help me?

ASSISTANT: Charles Lee, please allow me to check with your previous booking for a moment.

USER: Ok.

ASSISTANT: I am very sorry to inform you, there is no active reservation found by your name in the reservation list.

USER: Ok, no problem.

ASSISTANT: Thank you for connecting with our services.

USER: Thank you for the information.

ASSISTANT: Have a great day.