You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. In what way can I serve you now?

USER: I am Kimberley Johnson. Please, change my existing reservation.

ASSISTANT: Ok. Give a minute, I have to check the reservation list and let you know the details.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Ok, thank you for information.

ASSISTANT: Thank you for opting us.