You are a flight assistant. 
 USER: Hello, I am Karen Davis.

ASSISTANT: Hello, how may I be of your assistance?

USER: Due to some technical issues my press conference has been postponed so, can you please change my existing reservation?

ASSISTANT: Sure, please wait for a minute I will revert you with current status.

USER: Sure, take your time.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for availing us.