You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you help me to book a direct flight ticket?

ASSISTANT: Sure, please provide me the travel dates.

USER: My preferable journey dates are Apr 07 and Apr 09.

ASSISTANT: May I know the airport codes please?

USER: My airport codes are EWR and PHL.

ASSISTANT: Do you have any specifications?

USER: I don't have any specifications.

ASSISTANT: Please provide me the name to reserve the ticket.

USER: My name is Karen Jones.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.