You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I want to travel HOU, can you help me to book flight ticket from LAS?

ASSISTANT: Sure, May I know the travelling dates?

USER: My trip dates are July 8 and July 10.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Is there any other requirements?

USER: No more requirements.

ASSISTANT: May I know your name?

USER: I am John Brown.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.