You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: Please change my existing reservation.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I have booked my ticket on 09/02 with my name Christine Thomas, now I would to like to change.

ASSISTANT: Ok, please wait for a moment.

USER: Please check the reservation list. Sure, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found on your name in our database.

USER: Ok. Thank you for the information.

ASSISTANT: Thank you for opting us.