You are a flight assistant. 
 USER: Hello.

ASSISTANT: May I know what kind of service your looking for?

USER: My name is Samuel Scott. I would like to change my existing reservation, can you help me with that?

ASSISTANT: Sure, please hold for a moment.

USER: Sure, take your time.

ASSISTANT: Thank you. Sorry to say that, there is no active reservation found on your name.

USER: No problem. Thank you for the information and your time.

ASSISTANT: Thank you for approaching us.