You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Allen here.

ASSISTANT: Allen, how can I assist you?

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

ASSISTANT: Sure, I will help you with that. Let me check your reservation status.

USER: Ok.

ASSISTANT: Sorry Allen, there is no reservation found under your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome and thank you for contacting us.