You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Virginia Thomas, can you help me to book a flight from OAK on July 12?

ASSISTANT: I am willing to help you, may I know your return journey details?

USER: I am planning to return from DEN on July 14.

ASSISTANT:  What is your fare estimate for this booking?

USER: 500 is my price limit.

ASSISTANT: There is a direct flight-1019 with price 200, shall I proceed with booking?

USER: Proceed with booking.

ASSISTANT: Ok, your reservation has been done on AA airlines.

USER: Thank you.

ASSISTANT: You are welcome.