You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your helping hand today?

USER: I want to cancel my recent reservation due to sudden postpone of my client meeting. Can you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know on which name the ticket has been reserved?

USER: Sure, I am Dennis Johnson.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry we did not find any reservation against your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for approaching us.