You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Thank you for accepting my request.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Oh! It may not booked properly due to server issues. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.