You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I need to change my reservation due to my planned event got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, I will help you in that, please hold on for a moment to check your reservation status.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, myself Donna Harris.

ASSISTANT: Harris, there is no any active reservation with your name in my database.

USER: Oh! It may not be booked due to server issue.

ASSISTANT: Thank you for reaching us.