You are a flight assistant. 
 USER: Hello.

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

USER: I want to visit Boston, can you book a ticket please?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: My travel dates are 10/31 and 11/02.

ASSISTANT: Ok, let me check for the availability of flight. Could you please provide the airport codes?

USER: My airport codes are from PHL to BOS.

ASSISTANT: Ok. May I know your name to proceed further?

USER: I am Eric Martinez.

ASSISTANT: Thank you for providing the details. Eric, I am sorry to inform you that there is no flight available at your requested dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for contacting us. You are welcome.