You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Eric Lee here.

ASSISTANT: How can I assist you?

USER: Can you please book me a flight ticket from EWR to OAK?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travel dates are from Sept 17 to Sept 19.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight, no more requirements from my side.

ASSISTANT: Thanks for providing details, we are sorry to inform you that no flights are available on your journey routes.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for availing us.