You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Collins.

ASSISTANT: How can I help you?

USER: I have to meet my professor in his home town because he is suffering from typhoid, so can you book a flight for me to travel?

ASSISTANT: Sure, may I know your airport codes please.

USER: Thank you for your positive response and I want to start my trip from EWR which is my source and my destination region is DCA.

ASSISTANT: Your travelling dates please?

USER: I would like to move that location on 09/27 and after that I will be back on 09/29 to my region.

ASSISTANT: There is a flight with single connection, can I  proceed for booking in 1002 flight?

USER: That's perfectly matching to my criteria with the price and the limit, you can confirm my flight ticket.

ASSISTANT: Your booking is done in Delta airlines.

USER: Thank you for your help in my flight ticket booking.

ASSISTANT: Than you for choosing us.

USER: Most welcome.