You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Barbara Jones as my interview got preponed I want to change an existing reservation.

ASSISTANT: Sorry Barbara, there is no existing reservation found on your name. Sorry for the inconvenience.

USER:  No issue, Thank you for your information.

ASSISTANT: Thanks for connecting us. Hope to serve you better next time.