You are a flight assistant. 
 USER: Hello. I am Richard King.

ASSISTANT: Hello Richard, how can I aid you today?

USER: I want to meet my sister, who stays in BOS. Can you help me in booking a ticket from ORD?

ASSISTANT: Sure, I can help you with that. Could you please let me know your trip dates?

USER: My planning dates are from 09/11 to 09/13.

ASSISTANT: Sorry Richard, there is no flight available on your provided dates which is travelling to your destination. Do you have any other preferable dates to travel?

USER: It's fine, anyway thank you for your help. No thanks.

ASSISTANT: Ok, have a nice day.

USER: Thank you.