You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden meeting at office with my client on my boarding day, I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Sure, please mention your name for checking the information.

USER: Sure, I am Brian Perez.

ASSISTANT: Sorry, we can not found a reservation with your name in our data base.

USER: Ok, Thank you.

ASSISTANT: Welcome, thank you for reaching us.