You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Patrick Robinson here.

ASSISTANT: How may I help you?

USER: Can you please change my existing reservation which I have done 3 months back to attend a business meeting.

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no reservations found on this name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for approaching us.