You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please book a flight ticket from ORD to SFO?

ASSISTANT: Sure, please share your travel dates.

USER: My travelling dates are July 18 and July 20.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications to be met?

USER: I want a ticket in economy class.

ASSISTANT: Please share your name to proceed further.

USER: My name is Jacob Mitchell.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.