You are a flight assistant. 
 USER: Hello, I am Carolyn Johnson.

ASSISTANT: Hello, how can I be your helping hand?

USER: My visit to a tour got postponed, can you help me to cancel my recent reservation.?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. We could not found any reservation.

USER: Ok, thanks for the information.

ASSISTANT: Thank you, for choosing our agency.