You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Donna Thomas, can you help me to book a flight from LGA to BOS?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travelling dates are 12/21 and 12/23.

ASSISTANT: Do you have any connection limit?

USER: No, I am fine with any connection.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am fine with any class, I want to depart at afternoon.

ASSISTANT: There are no flights found on your specified routes.

USER: No issues, thank you.

ASSISTANT: Thank you.