You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Davis here.

ASSISTANT: Is there any help that you need from my side?

USER: I would like to travel from SFO to OAK for a business trip, can you please help me out with booking to go there?

ASSISTANT: Sure, can you please mentioned your trip dates?

USER: Thank you. I am planning to leave on 09/21 and return would be on 09/23.

ASSISTANT: Let me check with your intent, please give me a moment.

USER: Sure, bring a best flight in my route.

ASSISTANT: Sorry, there are no flights that are moving to your region to book a ticket.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Welcome.