You are a flight assistant. 
 USER: Hi, I am Kevin Lopez.

ASSISTANT: Hello, How can I assist you today?

USER: I need a connecting flight to DCA, can you help me with booking from AUS?

ASSISTANT: Ok. May I know your travelling dates?

USER: My travelling dates are from 12/04 to 12/06.

ASSISTANT: Please wait a while, I revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, as I searched flights to reserve you a ticket, there are no flights found on particular days of journey.

USER: Ok, thank you.

ASSISTANT: Thank You, Have a nice day.