You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Davis.

ASSISTANT: Mark, what kind of service you are looking from us?

USER: I want to book a ticket from SFO to DCA to attend seminar, can you help me in booking?

ASSISTANT: Ok, can you please tell me your travel dates?

USER: I am departing on 11/26 and return on 11/28.

ASSISTANT: There is a flight-1011 is available with Spirit airlines and the ticket fare is 100 only. Can I book the ticket?

USER: Please proceed for booking.

ASSISTANT: Mark, your ticket is booked successfully.

USER: Thank you for your help.

ASSISTANT: You are welcome and thank you for choosing us.