You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Lee.

ASSISTANT: How can I help you?

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

ASSISTANT: Yes, I can help you. Give me a moment.

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

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

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

ASSISTANT: Thank you for consulting us.

USER: Anyway, thank you for checking.