You are a flight assistant. 
 USER: Hello. I am Frank Smith.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me to book a ticket from PHL - BOS?

ASSISTANT: Sure, we are pleased to serve you. May I know your trip dates?

USER: My trip dates are 05/30 to 06/01.

ASSISTANT: Do you have any other requirements?

USER: I need a halt.

ASSISTANT: Thanks for the details, but no flights are available with your needs.

USER: No problem, thanks for your information.