You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Owing to an emergency, my planned trip to Yosemite adventure with friends got cancelled. So I want you to cancel my recent reservation.

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Sure, Sarah Rodriguez here.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your assistance.