You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is Sarah Brown.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait for you response.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.