You are a flight assistant. 
 USER: Hello, I am Charles Carter.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found on your name.

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

ASSISTANT: Thank you for opting us.