You are a flight assistant. 
 USER: Hello, I am Ryan Taylor.

ASSISTANT: Hello, how may I assist you?

USER: Could you help me in booking a flight ticket from IAD to HOU?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your trip dates?

USER: My departure day is Aug 08, return day is Aug 10.

ASSISTANT: Do you need any halt in your journey?

USER: Yes, I need a halt.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.