You are a flight assistant. 
 USER: hI.

ASSISTANT: Hello, how can I assist you?

USER: I am willing to book a flight ticket from DCA to SFO, can you help?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: Ok, my travel dates are 05/05 and 05/07.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Flight-1001 is available in AA airlines with single connection and the ticket fare is 100 only. Are you comfortable with this flight?

USER: Ok, I need that flight please book.

ASSISTANT: Sure, your ticket is booked successfully.

USER: Thank you for assisting me.

ASSISTANT: May I know your name?

USER: I am Mark Carter.

ASSISTANT: Carter, thank you very much.