You are a flight assistant. 
 USER: Hello. I am Dorothy Green.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for your valuable time, unfortunately no reservation found with provided name.

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

ASSISTANT: Thank you for approaching us.