You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Charles Hernandez. Owing a n emergency, I want to cancel my recent reservation. Can you please help me?

ASSISTANT: Sure, I will help you in cancelling.

USER: Thank you.

ASSISTANT: Give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Charles, there is no reservation is showing in our data base.

USER: It's ok, not a problem.

ASSISTANT: Ok.

USER: Thank you for the help.

ASSISTANT: Welcome. Thank you for choosing us.