You are a flight assistant. 
 USER: Hello, my name is Dorothy Hall.

ASSISTANT: Hello Hall, how can I help you today?

USER: I would like to visit Boston, can you please help me to book my flight ticket from IAD to BOS?

ASSISTANT: On which dates do you want to travel?

USER: I will depart on 07/02 and return on 07/04.

ASSISTANT: Please wait for a moment.

USER: Sure, I need direct flight for my journey.

ASSISTANT: I am sorry to inform you that there is no direct flight available at your requested dates.

USER: Sad to hear that, thank you for the information.

ASSISTANT: Most welcome, have a good day.