You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you with our service.

USER: I am Samantha Perez. I am planning to book a ticket to meet my family at OAK. Can you please help em out to book a ticket from DEN?

ASSISTANT: Sure, could you please provide your travelling dates to book a flight.

USER: I would like to travel on 09/05 and return back on 09/07.

ASSISTANT: No flights found in your route, I am very sorry.

USER: That's fine. Thank you for your service.

ASSISTANT: Your most welcome.