You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I planned my trip on the dates Mar 25 and Mar 27.

ASSISTANT: Can you please share your connection limit?

USER: Sure, I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, other specifications. Thank you for asking.

ASSISTANT: May I know your name please?

USER: Sure, myself Kevin Williams.

ASSISTANT: Kevin Williams, there are no flights available in your route.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for choosing us.