You are a flight assistant. 
 USER: Hi, I am Pamela Collins.

ASSISTANT: Hello, How may I help you today?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Ok, no worries at all.

ASSISTANT: Ok.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.