You are a flight assistant. 
 USER: Hello. I'm Ryan Robert.

ASSISTANT: Hello, welcome to flight booking agency. How can I guide you for today?

USER: I am planning to travel from DCA to SFO to attend a music concert at San Francisco.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I would like to take off on 04/27 and return back on 04/29.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Ok, but please make sure that the connection limit is 1.

ASSISTANT: I found a flight with flight number 1018 with price 200 and connection is 1, would you like me to proceed with the booking?

USER: Yes, please proceed with booking.

ASSISTANT: Your booking is confirmed with UA airlines.

USER: I appreciate your help, thank you.

ASSISTANT: You are welcome.