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

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in cancelling my reservation as the schedule to meet my head officer got postponed?

ASSISTANT: Sure. Please wait for a while, I will check and let you know. We have not found any flight reservation on your given name.

USER: Ok, Thanks for the information.

ASSISTANT: Thanks for choosing us.