You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Adams.

ASSISTANT:  How can I assist you?

USER: I am planning to go for a round trip to Boston, BOS. Can you book a flight ticket with a direct flight?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are from 12/28 to 12/30.

ASSISTANT: Could you provide me your connection preference?

USER: I need a direct flight.

ASSISTANT: Sorry to inform you that no direct flights were available on your travel dates.

USER: Ok, No issues. Thank you.

ASSISTANT:  Thank you for availing us.