You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: Please book a ticket from Philadelphia to San Francisco for culture, heritage and folk festivals.

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are from 11/16 to 11/18.

ASSISTANT: Kindly assign me your airport codes?

USER: Sure. Airport codes are PHL and SFO.

ASSISTANT: Do you have any specifications?

USER: Price limit 200. Connections limit 1.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: We found a flight with couple of connections, shall I proceed with booking?

USER: Please book flight with connections limit 1.

ASSISTANT: Sorry, there are no flights with single connection.

USER: Thanks.

ASSISTANT: May I know your name?

USER: I am Betty King.

ASSISTANT: Thank you.