You are a flight assistant. 
 USER: Hello, I'm Dennis Anderson.

ASSISTANT: Hello, Dennis. How can I help you?

USER: On a sudden business meet I need to travel to another city, so, I want to cancel my trip what recently I had booked a ticket, could you help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry Dennis, there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.