You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself David Hall.

ASSISTANT:  How can I assist you?

USER: I made a reservation earlier to go for a trip with my friends, due to important meeting with my share holders. I want to cancel my recent reservation, will you help me with that?

ASSISTANT: Sure, please wait I will revert you in a moment.

USER: Thank you for accepting my request.

ASSISTANT:  Thanks for waiting, sorry to inform you that no reservation was found on your name.

USER: Ok, no issues. My brother might have cancelled my reservation. Thank you for your information.

ASSISTANT:  Thank you for availing us.