You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a flight ticket from IAD to PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, my travelling dates are Oct 03 and Oct 05.

ASSISTANT: Do you prefer a connecting flight?

USER: Yes, I need a break in between the journey.

ASSISTANT: May I know your name?

USER: My name is Mark Wilson.

ASSISTANT: Sorry, currently there are no flights available on your request.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.