You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Thank you. I will wait for your response.

ASSISTANT: Paul, there is no reservation found under your name.

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

ASSISTANT: Thank you for contacting us, have a great day.