You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel recent reservation. Can you help me in cancellation of my ticket? I am Margaret Miller.

ASSISTANT: Sure, I'll help you.

USER: Ok.

ASSISTANT: Sorry Miller, there is no reservation with your name.

USER: Thank you.

ASSISTANT: Thank you to visit our agency.