You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book a flight ticket from IAH to DCA?

ASSISTANT: Sure, can you share me your travel dates?

USER: My trip dates are Aug  4 and Aug 6 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for connecting flight to travel.

ASSISTANT: Please let me know if you have any specifications.

USER: No other specifications.

ASSISTANT: Can I have your good name?

USER: Sharon Nelson here.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.