You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Eric Hernandez.

ASSISTANT: How can I help you at this moment?

USER: I would like to book a ticket from DCA to SFO, can you help me?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: My travel dates are 11/21 and 11/23.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Based on your information, UA airline is ready to serve you with 1 connection with a minimum fare of 100 is available for you. Shall I book this flight ticket for you?

USER: You can book it.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1019.

USER: Thank you for booking.

ASSISTANT: You are welcome Eric Hernandez.