You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anthony Harris.

ASSISTANT: How may I assist you today?

USER: Actually, I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, please wait a moment, let me check with your details.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations to cancel your ticket.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching our service.