You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at this moment?

USER: Can you help to book a flight ticket from PHL to BOS?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Ok, please book a ticket for the dates Jan 19 and 21st respectively.

ASSISTANT: Do you have any connection limit preference?

USER: Please book a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a economy class flight.

ASSISTANT: May I know your good name please?

USER: My name is Charles Wilson.

ASSISTANT: Charles Wilson, there are no flight services are available on this route on your provided dates.

USER: That is ok, thank you for assisting me as per my concern.

ASSISTANT: Thank you for contacting us.