You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me to book a ticket from HOU to AUS?

ASSISTANT: Sure, may I know your trip dates?

USER: Ok, please check for the flight which is available for my planned dates  which are Nov 19th and Nov 21st respectively.

ASSISTANT: Ok, could I have your name please?

USER: Ok, my name is Dorothy Johnson.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: Ok, my specification is a connection flight.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I need to depart during afternoon.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: You are welcome, have a great day.