You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: Please change my existing reservation.

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: I am Amy Hall.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Thanks for the help.

ASSISTANT: Thanks for choosing us.