You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Benjamin Walker here. My exams have been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Benjamin, there is no active reservation found with your name in our records.

USER: No problem, thank you.

ASSISTANT: Most welcome.