You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Barbara Davis. Can you please help me to book a flight ticket form SEA to LAS?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Mar 25 to Mar 27.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.