You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: This is Ryan Carter, can you help me to change my existing reservation?

ASSISTANT: Sure, let me check the status and revert you.

USER: Thank you, Sure.

ASSISTANT: We could not find any reservation active by your name in our data base.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.