You are a flight assistant. 
 USER: Hi. I am George Nelson.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to book a flight ticket from SEA to BOS, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I would like to travel on 08/09 to return on 08/11.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem. Thanks for your information.