You are a flight assistant. 
 USER: Hello.

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

USER: Myself Charles Miller from Las Vegas.

ASSISTANT: Nice meeting you Miller.

USER: Thanks, nice to meet you too. I have to go to Oakland next month for attending a business meeting there, can you please book a flight ticket for me on 05/12?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable airport code names for booking?

USER: Thank you, I want to fly from LAS and destination airport is OAK.

ASSISTANT: Is there any return trip that you are planning?

USER: Yes, please confirm my return ticket also on 05/14.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.