You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a flight ticket from DCA to HOU?

ASSISTANT: Sure, i am perky to help you. Please let me know your trip dates.

USER: My travel dates are May 16 and May 18.

ASSISTANT: Do you have any stopover in between journey?

USER: I prefer direct flight for this trip.

ASSISTANT: Is there any other specifications for you?

USER: I would like to depart in the afternoon time.

ASSISTANT: Can I have your good name?

USER: I am Anna Allen.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.