You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Owing to an emergency I want to cancel my recent reservation. Could you help me out?

ASSISTANT: Sure, may I have your good name? please.

USER: Reservation is done with my name Brandon Brown.

ASSISTANT: Please wait for a while,  I will revert to you.

USER: Sure.

ASSISTANT: Thanks for being patient but, no reservation is existed with your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for reaching us.