You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to book a direct flight ticket?

ASSISTANT: Sure, I will help you. May I know your origin and destination airport codes please?

USER: My airport codes are BOS and MSP.

ASSISTANT: Can I have your planned travel dates please?

USER: My preferable journey dates are Mar 26 and Mar 28.

ASSISTANT: May I know your name please?

USER: My name is Melissa Thompson.

ASSISTANT: Do you have any other specifications?

USER: I don't have any specifications.

ASSISTANT: Melissa Thompson, no flights has been found on your planned travel dates.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.