You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Lee.

ASSISTANT: How can I help you?

USER: I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, I will help you. Please, wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to change.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.