You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Scott Collins here.

ASSISTANT: How may I serve you?

USER: My business meeting has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Sure, I will help you with the change of flight reservation. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: It's ok, thank you.

ASSISTANT: Thank you.