You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I abet you today?

USER: Please change my existing reservation.

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: To proceed further I need your name for checking the reservation.

USER: I am Amy Brown.

ASSISTANT: Thanks for sharing your name. There is no reservation found on your name for further process.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.