You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide service to you?

USER: I want to go to San Francisco for shopping, can you please book a ticket? I need a direct flight.

ASSISTANT: Sure, can you please share your journey dates?

USER: I would like travel on 01/07 and return on 01/09.

ASSISTANT: Kindly ensure your journey points?

USER: I want to fly from SEA to SFO.

ASSISTANT: Do you have any limitations in price limit?

USER: Price limit is 500.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any flight matching your criteria.

USER: Ok. Thank you for your quick response.

ASSISTANT: Thank you for connecting with us. Have a great day.

USER: I am Richard King.