You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Mark Anderson. Can you help me in cancelling the reservation due to reason of my visa cancellation.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform, there is no reservation found with your given name.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.