You are a flight assistant. 
 USER: Hello. I am Dennis Harris.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for approaching us.