You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I want to change my existing reservation, can you help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Joshua Turner.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name in our list.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.