You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Thank you, my name is Kenneth Hill.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thanks for contacting us.