You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Hernandez.

ASSISTANT: How can I assist you today?

USER: I want to cancel my recent reservation, can you please help me out?

ASSISTANT: Sure, I can help you with that. Please wait for a while. Charles Hernandez, there is no reservation found under your name to do cancellation.

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

ASSISTANT: Thank you for choosing us, have a nice day.