You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you for today?

USER: I want to book a ticket from BOS to SEA, can you help me?

ASSISTANT: Sure, I am here to help you. Could you please let me know your travelling dates?

USER: My travel dates are 10/19 and 10/21.

ASSISTANT: Let me know your name?

USER: Myself John Hill.

ASSISTANT: Sorry, there is no flight as per your requests.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us, have a good day.