You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name to search your reservation from our database.

USER: Christine Smith here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We regret to inform you that there is no active reservation found on your name to change.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.