You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I know your name?

USER: Scott Anderson is my name.

ASSISTANT: Scott Anderson, what can I do for you today?

USER: On 12/17 I have to be there at my grand mother home on the eve of her 100th birthday.

ASSISTANT: That's great.

USER: So, book a ticket from Oakland, CA - OAK.

ASSISTANT: Sure, may I know your landing airport code?

USER: Washington DC - IAD is my preferred landing airport code.

ASSISTANT: Ok, on which dates you need to go there?

USER: I have to start on 12/17 and I should return on 12/19.

ASSISTANT: Do you have any other specifications?

USER: I need single stopover in between my journey to buy some things. Price should not cross 5000.

ASSISTANT: Scott, sorry to say you that there is no flight available on your route.

USER: Ok, I will try with some other airline. Thanks for the information.

ASSISTANT: Thank you for reaching us.