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 that.

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: On which name your ticket has been booked?

USER: I have reserved my ticket under the Patricia Roberts.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

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

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