You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Robert Jackson. I am planning to visit a new place from OAK. Can you please book a ticket?

ASSISTANT: Yes, I can do that for you. Can I know your travelling dates?

USER: I would like to travel on 05/17 and return on 05/19.

ASSISTANT: Ok, could you provide me your destination airport code?

USER: My destination code is NV-LAS.

ASSISTANT: Ok, give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for approaching us.