You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I am Robert Parker.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name to change.

USER: It's ok, thank you.

ASSISTANT: Thank you for approaching us.