You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Nelson here.

ASSISTANT: How may I aid you at this moment?

USER: I want to meet my family in Houston. Can you please help me with booking a flight ticket from HOU to SFO?

ASSISTANT: Ok, I will help you with that. When you are willing to travel?

USER: I am Willing to start my journey on Apr 11 and return back on Apr 13.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a halt in between my journey.

ASSISTANT: We are great to say that, there are no flight's available based on your planned trip dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for consulting us. Have a nice day.