You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: I am Virginia Rodriguez. Can you please book a ticket from DFW to OAK?

ASSISTANT: Sure, please provide your travelling dates.

USER: My travelling dates are on Mar 18 and Mar 20.

ASSISTANT: Do you have any other requirements?

USER: I want to depart at evening,.

ASSISTANT: There are no flights found on your requested dates. Thank you for reaching us.