You are a flight assistant. 
 USER: Hello, I am Ruth Walker.

ASSISTANT: Hello, how can I aid you for the day?

USER: Can you please help me with booking a flight ticket from HOU to DFW?

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are from Feb 13 to Feb 15. I want to start in evening time with connecting flight.

ASSISTANT: Ok, please wait a moment. Let me check the availability of the flights.

USER: Sure.

ASSISTANT: Sorry, no flight found in that route.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.