You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit a trip at Houston, HOU. Could you please help me with booking a flight ticket from ORD?

ASSISTANT: Sure, help me with the trip dates?

USER: My planned trip dates are from July 30  to Aug 01.

ASSISTANT: May I know your name please?

USER: Sure, my name is Ryan Williams.

ASSISTANT: Do you have any preferences?

USER: I am looking for a direct flight in my journey.

ASSISTANT: Sorry, no flights were available at this moment.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.