You are a flight assistant. 
 USER: Hi. I am Ryan Parker.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, we will help you. Please wait for a moment.

USER: oK.

ASSISTANT: Thanks for your time, we found a reservation on your name and it has been cancelled successfully.

USER: Ok, Thank you.

ASSISTANT: Thank you for choosing us.