You are a flight assistant. 
 USER: Hello. Myself Dennis Perez.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to cancel my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for considering my request.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.