You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a flight ticket from Denver, DEN to Boston, BOS?

ASSISTANT: Please provide your trip dates.

USER: Ok, please book a flight ticket for the dates July 8th and July 10th.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you need any other specifications?

USER: Can you book a flight which depart during afternoon.

ASSISTANT: May I know your name?

USER: My name is Andrew Martinez.

ASSISTANT: There are no flights available on your routes.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for choosing us.