You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Richard Martin, I have to meet my son at his college at Houston. Can you help me to book with one connection?

ASSISTANT: Sure, Please help me with your travel dates.

USER: Sure, I like leave Los Angles on 12/16 and return on 12/18.

ASSISTANT: May I know the journey codes?

USER: Ok, I would to fly from airport LAX and it is better yo get flight to TX-HOU airport.

ASSISTANT: We have found a direct flight from UA airline. Shall I proceed?

USER: No, I need a fight with one connection.

ASSISTANT: Sorry, It is not available. Thank you for opting us.

USER: Ok, thanks for helping me.