You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Please help me to change my recent reservation.

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

USER: Emma Young.

ASSISTANT: Ok,  please wait a moment.

USER: Sure.

ASSISTANT: Sorry Emma Young, no reservation has found under your name to change.

USER: Thank you for your information.

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