You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am a politician, I have to meet mayor of New York. Could you book my ticket from Seattle?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My itinerary dates are Apr 2 and Apr 4.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: My genesis and terminus airport codes are SEA and EWR.

ASSISTANT: Do you  prefer any specific airlines  to travel?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Can I have your good name please?

USER: Robert Martin here.

ASSISTANT: Sorry to  inform you that no flight is available to you on your planned dates.

USER: I prefer to travel in business class.

ASSISTANT: Sorry, no flight is available to you.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us, have a good day.