You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I'm planning to visit Washington, can you book a ticket from EWR to IAD?

ASSISTANT: May I know on what dates would you like to travel?

USER: My planned departure and return travel dates are 13th and 15th of September.

ASSISTANT: May I know your connections?

USER: I prefer single connected flight.

ASSISTANT: Do you prefer any specifications?

USER: No.

ASSISTANT: Please share your name.

USER: My name is Sarah Collins.

ASSISTANT: UA airlines providing a connected flight in economy class.

USER: That's fine, proceed for booking.

ASSISTANT: Your booking is done.

USER: Thank you so much for your help.

ASSISTANT: Thank you.