You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I would like to book a ticket from PHX to BOS, can you please help me out?

ASSISTANT: Sure, May I know the travelling dates?

USER: I am travelling on these dates July 17th and 19th.

ASSISTANT: Do you have any connection limit?

USER: I need single connected flight.

ASSISTANT: Is there any other requirements?

USER: I prefer return time in the afternoon.

ASSISTANT: May I know your name?

USER: Richard Garcia here.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for opting us.