You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Mark Hill here. I'm planning to visit Boston, can you please book a ticket from MSP to BOS?

ASSISTANT: Sure, can you please help me with your travelling dates?

USER: Sure, my planned departure and return travel dates are 4th and 6th of June.

ASSISTANT: Do you have any class preference?

USER: No, any class is ok for me.

ASSISTANT: Do you have any requirements?

USER: Yes, I want to return back from my destination on the afternoon.

ASSISTANT: Wait a minute.

USER: Sure, take your own time.

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

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

ASSISTANT: Thank you for reaching us.