You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, we are greatful to serve you.

USER:  My name is  Gary Walker ,I want to cancel my recent reservation.

ASSISTANT: Sure, please stand by, let me check and get back to you.

USER: OK.

ASSISTANT: Sorry, unfortunately no reservation has found on your name.

USER: Thank you.

ASSISTANT: Pleasure to serve you. thanks you for choosing us.