You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you?

USER: I am Deborah Rodriguez. I need to book a ticket to meet my friend on 12/08 for attending the seminar in UNIVERSITY.

ASSISTANT: Sure, do you have any price limit?

USER: Could you please help me in booking a return ticket on 12/10?

ASSISTANT: Ok.

USER: Price should be below 500.

ASSISTANT: Help me with the airport codes?

USER: Source and destination codes are PHX and OAK.

ASSISTANT: Thank you for your details, we found a flight in an airline UA of number 1000 with a price of 200. Shall I proceed to book?

USER: You can proceed with booking.

ASSISTANT: Your flight ticket is booked.

USER: Thank you for your service.

ASSISTANT: Thank you for your approach.