You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Green here.

ASSISTANT: How may I guide you?

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

ASSISTANT: Sure, I am happy to help you in that one, Please give me a moment.

USER: Sure.

ASSISTANT: Thank your for waiting, there is no reservation found for the user name to modify your flight ticket.

USER: It's ok, thank you.

ASSISTANT: It's my pleasure and have a nice day.