You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: Please book a ticket from Washington DC-IAD to Oakland, CA-OAK. I am Edward Young.

ASSISTANT: Sure, may I know your travel dates?

USER: Departure is on 09/10 and will intend to return by 09/12.

ASSISTANT: Do you have any specification?

USER: Price limit is 200. Connections limit is 1.

ASSISTANT: Unfortunately there is no flight on your details.

USER: Thanks for your assistance.

ASSISTANT: Thanks for choosing us.