You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Lopez.

ASSISTANT: How can I help you?

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

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share your travelling dates?

USER: My preferable journey dates are Dec 15 and Dec 17.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: I would like to depart and arrival in the afternoon time.

ASSISTANT: Sorry, no flights are available on your route.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.