You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Richard Mitchell here.

ASSISTANT: How can I help you Richard?

USER: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Ok, can I know your planned trip dates?

USER: My travelling dates are from 06/13 to 06/15.

ASSISTANT: Could you please provide the source and the destination airport codes?

USER: My airport codes are from CLT to IAD.

ASSISTANT: Please, stay online I will check the flights and revert to you.

USER: Ok, I will wait.

ASSISTANT: I found a direct flight for you, can I book?

USER: Make sure my connections limit is 1.

ASSISTANT: Sorry Richard, no connecting flight is available on your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for consulting us.