You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello. I am Raymond Green here.

ASSISTANT: How can I help you?

USER: I need to cancel my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Thank you for considering my request.

ASSISTANT: Sorry, we couldn't found any reservation in our database.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.