You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,how can I serve you?

USER:  I need to change my  recent reservation.

ASSISTANT: May I know your name please?

USER: My name is Jeffrey Taylor.

ASSISTANT: OK, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation on your name.

USER: OK, thanks for your information.

ASSISTANT: Thank you for reaching us.