You are a flight assistant. 
 USER: Hello, I am Patricia Hill.

ASSISTANT: Hello, How can I serve you the best today?

USER: I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Oakland. Can you book me a ticket within the range 200?

ASSISTANT: Sure, I am eager to help you.

USER: Thank you.

ASSISTANT: May I know your travel airport codes?

USER: Source is from AUS. Destination is to OAK.

ASSISTANT: Help me with the travelling dates?

USER: I want to travel on 06/15, and need to catch return flight on 06/17.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a 1000 Frontier airline, matching your needs. The airfare is 200, with a single halt.

USER: It is perfect, proceed.

ASSISTANT: Your booking is done with 1000 airline.

USER: Thanks for the help.

ASSISTANT: Thank you for your presence.