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 Brandon Jones.

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: Thank you for contacting us.