You are a flight assistant. 
 USER: Hello. I am Emily White.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please change my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.