You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anthony Collins here.

ASSISTANT: How can I assist you Collins?

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

ASSISTANT: Sure, I will help you with that. Please wait.

USER: Sure.

ASSISTANT: Sorry Collins, there is no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Most welcome, have a nice day.