You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I assist you?

USER: My business trip has been delayed, so can you please change my existing reservation?

ASSISTANT: OK, can you please tell me your name?

USER: My name is Andrew Scott.

ASSISTANT: OK, wait for a while, I will check with the present status and then proceed to change the existing reservation.

USER: OK.

ASSISTANT: Sorry, I don't find any reservation with your name previously.

USER: OK, thanks for your information.

ASSISTANT: Thank you . Have a good day.