You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My friends planned to enjoy the Beer festival at Beer Can house in Houston, TX - IAH, so I need to book a flight ticket to Houston. Will you help me to book a ticket within the price of 500?

ASSISTANT: Sure, I will help you. When would you like to travel?

USER: I would like to start on 04/08 and recur on 04/10.

ASSISTANT: Where would you start your journey?

USER: My nearest airport is CA - OAK at Oakland, so I need to start from there.

ASSISTANT: May I know your good name please?

USER: My name is Steven Robinson.

ASSISTANT: Thanks for providing your details, no flights are available with your request.

USER: Ok, not an issue. Thanks for your support.

ASSISTANT: Thanks for approaching us.