You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Due to sudden changes in my trip, I want to cancel my reservation. Can you please help me with this?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check whether any active reservation found on your name or not?

USER: Reservation has been done on the name of Daniel Harris.

ASSISTANT: Sorry  Daniel Harris, there is no active reservation on your name in our database.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.