You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a ticket from CLT to HOU. Can you please help me out?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I am planning to travel on Oct 20 and return back on Oct 22.

ASSISTANT: Do you have any requirements?

USER: I am looking for a direct flight.

ASSISTANT: Let me know your name?

USER: My name is Ronald Brown.

ASSISTANT: Sorry to say, no flight is available for you.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.