You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Can you please book a flight ticket with the name of Brandon Moore as I am planning to meet my childhood friends at Oakland, OAK?

ASSISTANT: Sure. May I know your travelling dates?

USER: My preferable dates are 08/08 to 08/10.

ASSISTANT: Let me know your origin.

USER: Washington, IAD is my boarding point.

ASSISTANT: Do you have any preferences?

USER: Yes, there should be a lay by. Price should not exceed 200.

ASSISTANT: There is no flights found under the range of 200.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thanks for choosing us.