You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Brenda Lewis. I am planning to book a ticket from DFW to IAH. Can you please help me out?

ASSISTANT: Sure, I am happy to help you and can you please mention your preferable travel dates?

USER: I would like to travel on Oct 18 and return back on Oct 20.

ASSISTANT: Is there any other preference that you need?

USER: Yes, I am looking for a direct flight.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found on your journey dates to book the ticket.

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

ASSISTANT: You are most welcome and thank you for reaching us.