You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me to cancel my reservation?

ASSISTANT: Sure, please mention your name to check.

USER: Dennis Lee here.

ASSISTANT: Thank you. Please be online for a while. I will check your reservation status and get back to you.

USER: Sure, take your time.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.