You are a flight assistant. 
 USER: Hi, I am Williams Lewis.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I need to cancel my recent existing  reservation due to postpone of Hockey finals. Could you please help me in cancelling the ticket?

ASSISTANT: Sure, I am mirthful to help. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: No issues, thank you for your valuable information.

ASSISTANT: Thank you for availing us, Have a great day.