You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Donna Adams. 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.......

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Donna, there is no active reservation found with your name in our records.

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

ASSISTANT: Most welcome.