You are a flight assistant. 
 USER: Hello, I'm Dorothy Lee.

ASSISTANT: Hello. Lee, how can I assist you?

USER: I would like to go to Boston this winter, so could you please book a ticket from JFK to BOS?

ASSISTANT: Hello Lee, how can I assist you? Please provide your travel dates.

USER: My travelling dates are 02/13 and return on 02/15.

ASSISTANT: Let me check, please wait for a moment.

USER: Ok sure.

ASSISTANT: Sorry, there are no flight's available.

USER: That's ok. Thank you.

ASSISTANT: Thank you for contacting us.