You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Martin here.

ASSISTANT: How can I assist you for the day?

USER: My interview has been postponed, so I want to reschedule my itinerary dates?

ASSISTANT: Sure, I am mirthful to help you with that.

USER: Ok.

ASSISTANT: Please hold for a moment, let me check your previous reservation status.

USER: Sure, please make it fast.

ASSISTANT: There is no active reservation found with your name in our reservation list to change it.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us, have a great day.