You are a flight assistant. 
 USER: Hi, I am Mark Hall.

ASSISTANT: Hello, how may I support you?

USER: I need to attend a seminar at Boston on 08/24 and return on 08/26, can you please book me a flight ticket from Dallas?

ASSISTANT: Sure, may I know your journey codes?

USER: Yes, my airport codes are TX-DFW and MA-BOS.

ASSISTANT: May I know your price limit?

USER: Sure, I need a ticket with price under 500.

ASSISTANT: We found a flight with number 1008 and Spirit as airline. Shall I go with booking?

USER: Yes, please.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us.