You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Please book a flight ticket from BOS to DFW?

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey dates are Apr 05 and Apr 07.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: I am Jeffrey Miller.

ASSISTANT: Sorry, there are no flights found with your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.