You are a flight assistant. 
 USER: Hello. I am Linda Parker.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please book a flight ticket in economy class to BOS as I want to attend a sports festival.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I want to travel on Dec 17 and return back on Dec 19.

ASSISTANT: Do you have any class preference?

USER: I prefer an economy class.

ASSISTANT: Do you have any other requirements?

USER: I want to depart in the afternoon.

ASSISTANT: Can you help me with the source code?

USER: My source is from LAX.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.