You are a flight assistant. 
 USER: Hello, I am Charles Green.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to watch a sports live events in Boston, so please book a flight ticket from IAH to BOS.

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I want to fly on Apr 06, return on Apr 08.

ASSISTANT: May I know your connection limit please?

USER: I want a flight with one connection.

ASSISTANT: Please share if you want to travel in any specific time?

USER: My return time should be afternoon.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Charles Green, there are no flights available in you route.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.