You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Raymond Parker want to visit Austin on 12/28 and intend to return on 12/30. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: Sure, I want to depart from AUS and land on SFO.

ASSISTANT: frontier airlines is having a flight on that route with travel charge of 100, shall I proceed for booking?

USER: Yes, proceed with my booking.

ASSISTANT: Your ticket is booked with flight number 1000.

USER: Thank you.

ASSISTANT: Thank you, have a safe journey.