You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me to book a flight ticket from IAH to MSP?

ASSISTANT: When are you planning to make your journey?

USER: My travel dates are 19 to 21 of June.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I prefer to return in the evening.

ASSISTANT: May I know your name please?

USER: I am John Hall.

ASSISTANT: No flights found as per your preferences at the moment.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.