You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, I will help you. Please provide the name on which ticket was reserved to do so.

USER: Nancy Lopez here.

ASSISTANT: I have fund your reservation in our records, may I know your new travelling dates?

USER: My itinerary dates are Feb 17 and Feb 19.

ASSISTANT: May I know your nearby airport codes?

USER: My genesis and terminus airport codes are DEN and DCA.

ASSISTANT: Do you have any preferences?

USER: I want to return in the evening.

ASSISTANT: Sorry, there is no flight available with your journey dates.

USER: No problem, thank you.

ASSISTANT: You are welcome, have a nice day.