You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, we are here to help you. Can I have your name to check the reservation status?

USER: Emma Robinson.

ASSISTANT: Thank you for giving your name, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry there is no active reservation have been found under your name in our database to change it.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us.