You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Williams.

ASSISTANT: How may I help you today?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure, take your time.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

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

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

USER: Thank you for your help.

ASSISTANT: Welcome.