You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Joshua Martinez. I would like to book a ticket from DTW to IAD, can you please help me out?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I am travelling on these dates July 2nd and 4th.

ASSISTANT: Do you have any specifications?

USER: I need a single connected flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer return in the evening.

ASSISTANT: Please give me a moment.

USER: I prefer economy class.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome, have a great day.