You are a flight assistant. 
 USER: Hi. I am Thomas Walker.

ASSISTANT: Hello, how may I support you today?

USER: I need to complete my research under well experienced professor in Columbia University so, I am planning to go to Columbia University on 03/11. Can you please make a reservation for me?

ASSISTANT: Sure, may I know your boarding and landing airport codes?

USER: Ok, my boarding and landing airport codes are Washington, DCA  and New York, LGA.

ASSISTANT: When would you like to return?

USER: I would like to return on 03/13.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I preferred to go with connecting flight only.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a connecting flight with fare of 100 in Delta airline. Shall I proceed for booking?

USER: That's perfect, please proceed.

ASSISTANT: Your ticket has been booked with in 1020 flight number.

USER: Ok, thank you so much for flight booking.

ASSISTANT: Thanks for opting us, have a nice day.