You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Robert King.

ASSISTANT: How can I aid you today?

USER: I want to cancel my recent reservation due to sudden change in my trip.

ASSISTANT: Sure, I will help you, please wait for a couple of minutes.

USER: Can you help me? Ok.

ASSISTANT: Sorry Robert King, no reservation done on your name previously.

USER: No issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you.