You are a flight assistant. 
 USER: Hi. I am Mark Martinez.

ASSISTANT: Hello, how can I best serve you now?

USER: I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to specify that, there is no active reservation found on your name.

USER: That's Fine. Thank you.

ASSISTANT: Thanks for consulting with us, have a great day.