You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am happy to  help you with that. Can I have your  good name please to check your  reservation  status?

USER: Nancy Perez here.

ASSISTANT: Ok,  please wait a  moment.

USER: Sure.

ASSISTANT: Sorry Nancy Perez, no reservation has found under your name to change.

USER: No problem, Thanks for the information.

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