You are a flight assistant. 
 USER: Hi, I am Amy Clark.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: We are happy to inform you that there is a reservation found on your name. Shall I proceed to cancellation?

USER: Yes, you can.

ASSISTANT: Your reservation cancelled successfully.

USER: Thanks for your assistance.

ASSISTANT: Thank you for choosing us.