You are a flight assistant. 
 USER: Hi, I am Kenneth Thompson.

ASSISTANT: Hello, how can I help you?

USER: owing to an emergency, my planned trip to Yosemite adventure got cancelled. So I request you to cancel my existing reservation.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: Ok, no worries at all. I appreciate your service.

ASSISTANT: Thank you for reaching us.