You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to cancel my recent reservation, as my health is not good to travel.

ASSISTANT: Could you please mention your good name?

USER: I am Donald Miller.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Miller, I have not find any reservation under your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: It's my pleasure, have a great day.