You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please provide your name to proceed further.

USER: Alexander Hill here.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your time, There was no reservation found on your given name to change it.

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

ASSISTANT: Thank you for approaching us.