You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven Hill.

ASSISTANT: How can I assist you?

USER: I want to visit a historical place in Boston. Can you help me to book a ticket from SEA to BOS?

ASSISTANT: Can I know your travel dates?

USER: I want to travel on 05/27 and 05/29.

ASSISTANT: Hill, there is no flight available on your requested dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are welcome.