You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Please let me know, What can I do for you?

USER: Owing to an emergency, my appointment with dentist got cancelled. So I request you to cancel my existing reservation.

ASSISTANT: Sure, I can help you in that. May I know your name, to check your reservation status?

USER: Sure, I have a recent reservation with name Jessica Martin.

ASSISTANT: Thanks for your time. Sorry Jessica Martin, there is no active reservation on your name to cancel it.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thanks for approaching us.