You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I planned to meet my friend in MSP, can you please help me to book a flight ticket from BOS?

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

USER: I prefer to travel on Jul 18 and Jul 20.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Margaret Lopez.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.