You are a flight assistant. 
 USER: Hello, I am Brian Jackson.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, I need to cancel my recent reservation. Could you please help me in cancelling?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for choosing us.