You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight from ORD to HOU?

ASSISTANT: Sure, I am happy to help you. Can you please let me know your travelling dates?

USER: I want to travel on Mar 3 and need to return on Mar 5.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: May I know your good name?

USER: Myself Patrick Allen.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for choosing us.