You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Owing to emergency, I need to cancel my recent reservation. Please help me in that.

ASSISTANT: Sure, We are here to assist you. May I know your name?

USER: Thank you.

ASSISTANT: Give me a minute.

USER: My name is Nicholas Collins. Ok.

ASSISTANT:  Thanks for being waiting, We didn't found any reservation by this name.

USER: Thanks for your information.

ASSISTANT: Thank you for opting us.