You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory King here.

ASSISTANT: King, how can I help you today?

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

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry King, no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Thank you.