You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Benjamin Jackson here. Can you please help me in booking a flight ticket from DEN to OAK?

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to return in the morning.

ASSISTANT: May I know your itinerary dates please?

USER: Sure, my travel dates are from Nov 24 to Nov 26.

ASSISTANT: Do you have any requirements?

USER: I prefer normal cost for my trip.

ASSISTANT: Sorry, no flight is available for you as per your requests.

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

ASSISTANT: Thank you for reaching us.