You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency, my planned trip to Yosemite adventure has been cancelled. So I request you to cancel my recent reservation?

ASSISTANT: Sure, please let me know your name.

USER: Sure, my name is David Davis.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no issues at all. Thank you for your assistance.

ASSISTANT: Have a good day.