You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning.

USER: Myself David Williams.

ASSISTANT: David, how can I help you now?

USER: I will be attending a research program on rare species plants, can you book me a ticket?

ASSISTANT: That's great, I will help you in booking the flight ticket. May I know the travelling dates of your journey?

USER: The journey dates will be from 09/10 to 09/12.

ASSISTANT: May I know the airport codes?

USER: DTW to DCA are my travelling codes.

ASSISTANT: Please wait for a while.

USER: Check the availability with only 1 connection.

ASSISTANT: Sorry David, there are no flights found on your requirement. Do you have any other plans to travel?

USER: That's ok, no issues with it.I will travel by train now.

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

USER: Thanks for your humble service.

ASSISTANT: You are welcome.