You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from HOU to JFK?

ASSISTANT: Sure, may I know your name?

USER: I am Daniel Harris.

ASSISTANT: Can I know your travelling dates?

USER: Sure, I want to travel on Nov 6 and need to return on Nov 8.

ASSISTANT: May I know your other preferences?

USER: I need a flight with single connection.

ASSISTANT: Wait a minute.

USER: Sure.

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

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.