You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Green.

ASSISTANT: Green, how may I aid you?

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

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Thank you. Take your time to check.

ASSISTANT: Sorry, no reservation is available by your name.

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

ASSISTANT: Thank you for choosing us.

USER: Most welcome.