You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I am Patrick  Campbell. I want to fly from OAK to HOU, please book a flight as I need to attend my sister'd marriage.

ASSISTANT: Sure. Do you have any specifications?

USER: I need the ticket under price 500.

ASSISTANT: Let me know your travelling dates to check the flights.

USER: My travelling dates are from 05/11 to 05/13.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: There is a flight with airline: Frontier, flight number:1004, price 100, 1 connection. Shall I proceed?

USER: Please go with booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.