You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to go Oakland next week for my film shooting purpose, can you please book a direct flight for me?

ASSISTANT: Sure, I will help you with this.

USER: Thanks.

ASSISTANT: Can you please provide the dates on which you are willing to travel?

USER: My departure date is 03/09 and please book my return ticket also on 03/11.

ASSISTANT: May I know your nearest airport codes of travelling to proceed further?

USER: I want to fly from DEN and destination airport is OAK.

ASSISTANT: Meanwhile, please provide your good name.

USER: Sure, my name is Alexander Martinez.

ASSISTANT: Alexander Martinez, there are no flights available on this route with direct flight.

USER: Oh! It's ok no problem, I will go with another airline service.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.