You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Benjamin Allen here.

ASSISTANT: How may I assist you?

USER: Can you please reserve a flight from DCA to SFO for my journey?

ASSISTANT: Sure, can I have your planned travel dates please?

USER: My journey dates are from Dec 19th to Dec 21st.

ASSISTANT: Do you have any specifications?

USER: I need an economy class reservation with 1 connection flight.

ASSISTANT: I found an economy class ticket in AA airlines with fare 100 and it is a direct flight. Can I book your ticket?

USER: That's fine, please book it for me.

ASSISTANT: Ok, your booking is confirmed with flight number 1000.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.

USER: Welcome.