You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please change my existing reservation, because my presentation regarding project got postponed in clients location.

ASSISTANT: Sure, can you please provide your name?

USER: So, change reservation with my name Kimberly Turner.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok. Thanks for your quick response.

ASSISTANT: Thank you for reaching us, have a good day.