You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Melissa Davis. I would like to cancel my existing reservation which has been booked earlier this week.

ASSISTANT: Please give me a moment to check.

USER: Ok, please take your best time.

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

USER: It is ok. Thank you for the information.

ASSISTANT: You are most welcome.