You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Lopez.

ASSISTANT: How can I aid you?

USER: I am planning to visit Houston, can you please book me a ticket from BOS to IAH?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My preferable journey dates are from Mar 20 and Mar 22.

ASSISTANT: Do you have any specifications?

USER: I prefer to return at evening flight.

ASSISTANT: May I know about the connection limit?

USER: I prefer direct flight for this trip.

ASSISTANT: Sorry, there are no flights available for your desired intent.

USER: Ok, not an issue. Thanks for your time.

ASSISTANT: Thank you for reaching us.