You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Steven Young. I would like to book a ticket from DCA to EWR, to attend a conference.

ASSISTANT: Sure, may I know your travel dates?

USER: My itinerary dates are Apr 27 and Apr 29.

ASSISTANT: Do you prefer economy or business class?

USER: I am flexible with either classes.

ASSISTANT: At what time do you like to depart and return?

USER: I would like to depart in the afternoon.

ASSISTANT: Do you prefer connecting flight or direct flight?

USER: I I would like to board on single connection flight.

ASSISTANT: Do you have any other specifications?

USER: No, I have none.

ASSISTANT: I am sorry to inform you that there is no flight on your route.

USER: No problem, thank you for the time and information.

ASSISTANT: Thank you for choosing us.