You are a flight assistant. 
 USER: Hello, I am Donald Walker.

ASSISTANT: Hello, how can I help you?

USER: My plan to meet my friends got cancelled, so I would like to cancel my recent reservation. Can you please help me in cancelling?

ASSISTANT: Sure, I am happy to help you. Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, no worries at all. Thanks for your service.

ASSISTANT: Thanks for choosing us.