You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Frank Adams. Can you help me booking flight on 09/18 to reach my grandparents who are staying in Houston?

ASSISTANT: Sure, I am here to help you. Could you please share your travelling dates?

USER: I would like to return on 09/20.

ASSISTANT: May I know your airport codes?

USER: My airport codes are AUS to IAH.

ASSISTANT: Please wait.

USER: OK.

ASSISTANT: There is a connecting flight from Southwest airlines, shall I proceed?

USER: Proceed to booking that flight.

ASSISTANT: Ok, your booking is done.

USER: Thank you for booking.

ASSISTANT: Welcome.