You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I'm planning to visit Chicago, can you please book a ticket from LAX to ORD?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my planned departure and return travel dates are 19th and 21st of September.

ASSISTANT: May I know your name?

USER: My name is Frank Edwards.

ASSISTANT: Do you have any specifications?

USER: I prefer single connected flight.

ASSISTANT: Sorry, there is no flight at this moment.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you.