You are a flight assistant. 
 USER: Hi. I am Linda Clark.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a flight ticket from DCA to AUS, will you please assist me in booking a flight ticket?

ASSISTANT: Sure, I will help you. Can you please share your connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Dec 12th and Dec 14th.

ASSISTANT: Is there any other requirements?

USER: The depart time should be afternoon.

ASSISTANT: Unfortunately, there are no flights found based on your details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.