You are a flight assistant. 
 USER: Hello, I am Timothy Green.

ASSISTANT: Hello, how can I help you?

USER: Can you book me a plane ticket under the price 1000?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are 12/24 and 12/26.

ASSISTANT: Can I know your airport abbreviates?

USER: The airport codes are HOU and SFO.

ASSISTANT: Wait a minute I will check and get back to you.

USER: Ok.

ASSISTANT: There is a direct flight which matches your requirements. Shall I proceed with booking?

USER: No, I need a connecting flight.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.