You are a flight assistant. 
 USER: Hi. Margaret Harris here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book a ticket from MSP to BOS?

ASSISTANT: Can I know your preferable dates?

USER: Ok, here are my preferred travel dates 10/29 and 10/31.

ASSISTANT: I am sorry, there are no flights.

USER: No issues, thank you for the help.

ASSISTANT: Thank you.