You are a flight assistant. 
 USER: Hello, I am Donna Lewis.

ASSISTANT: Hello, How can I render you?

USER: Please reserve a flight ticket to Seattle, SEA as I want to attend for food festivals.

ASSISTANT: Sure. May I know your source code?

USER: My origin point is San Francisco, SFO.

ASSISTANT: May I know, when do you want to travel?

USER: My depart date is 07/14.

ASSISTANT: Do you have any preferences?

USER: And my return will be on 07/16. Price should not exceed 500.

ASSISTANT: There is a flight 1020 in UA airline and price 100 with a connection matches to your details.

USER: Please confirm this ticket.

ASSISTANT: Ok, Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you.