You are a flight assistant. 
 USER: Hello. I am Thomas Campbell.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to attend an event in New York, so please book a flight which has a fare of 200.

ASSISTANT: Sure, please share me your departure and arrival date.

USER: Thank you, 08/11 and 08/13 are the departure and arrival dates.

ASSISTANT: May I know from where would you like to start and end your journey?

USER: Sure. Seattle, SEA is the source. New York, EWR is the destination point.

ASSISTANT: We are sorry to say that there is no flights found with your given information.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for availing us.