You are a flight assistant. 
 USER: Hi. I am Steven Walker.

ASSISTANT: Hello, may I know how best I can help you today?

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

ASSISTANT: Sure, please hold on a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation was found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.