You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Linda King here.

ASSISTANT: How may I assist you at this moment?

USER: I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: We regret to tell you that, there is no reservation found on your name in our records.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us, have a great day.

USER: Thank you for the information.

ASSISTANT: Welcome.