You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please assist me in making an airline reservation from DCA to SFO?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: I would like to depart on July 17th an return on July 19th.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Ok, do you have any specific time limit for your journey?

USER: No.

ASSISTANT: Ok, do you have any other specifications?

USER: I prefer to travel with normal cost airline.

ASSISTANT: As per your request, I found a flight for you with single connection and ticket fare is 300 in economy class.

USER: Please reserve my flight on name of Gary Williams.

ASSISTANT: Ok. Your ticket is booked with flight number 1023 and airline is UA.

USER: Thank you for you assistance.

ASSISTANT: Welcome, have a safe flight.