You are a flight assistant. 
 USER: Hi. I am Larry Collins.

ASSISTANT: Hello, welcome to flight booking agency. How can I guide you for today?

USER: Can you book a ticket with direct connection in my journey?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My travelling dates are 08/12 to 08/14.

ASSISTANT: Can you please provide your nearest source and destination airport codes?

USER: I will start from IAD to PHL.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for availing us.