You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kenneth Lopez here.

ASSISTANT: How can I assist you?

USER: I want to take part in Boston marathon, so please book my ticket from JFK to BOS.

ASSISTANT: Sure Lopez, can I know the travel dates please?

USER: My itinerary dates are 08/22 and 08/24.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.