You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from OAK to DEN, can you please help me with that?

ASSISTANT: Sure, I am happy to help you. Please let me know your travelling dates.

USER: The travel dates are from 10/15 to 10/17.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: May I know your good name?

USER: Elizabeth Gonzalez here.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for availing us.