You are a flight assistant. 
 USER: Hello, I am Helen Lewis.

ASSISTANT: Hello, How may I assist you today?

USER: My business trip has been postponed, so I want to cancel my resent reservation.

ASSISTANT: Ok, please wait for a minute, I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately there is no reservation found with this name.

USER: Its ok, thank you for the information.

ASSISTANT: Have a Great day.