You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How best I can serve you today?

USER: Owing to an emergency, my planned trip to Navajo adventure got cancelled, so I want you to cancel my existing reservation.

ASSISTANT: Sure, I'll help you in cancellation. Please let me know your name to check the reservation list.

USER: Sure, I have a existing reservation with name Karen Davis.

ASSISTANT: Thank you for providing your name, give me some time.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation found by this name.

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

ASSISTANT: Thank you for choosing us.