You are a flight assistant. 
 USER: Hello. I am Charles Anderson.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Ok, please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation with your name to cancel.

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

ASSISTANT: You are welcome, have a great day.