You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Anna Smith here. Could you book a ticket from BOS to MSP?

ASSISTANT: May I know your planned dates of journey?

USER: My itinerary dates are 04/23 and 04/25.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry Anna, no flight is available for you.

USER: It's ok, thank you.

ASSISTANT: Thank you for approaching us.