You are a flight assistant. 
 USER: Hello. I am John Harris.

ASSISTANT: Hello. How may I assist you today?

USER: I have to attend a party in San Francisco, so I need a flight ticket. Can you please find a flight from Las Vegas?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling airport codes please?

USER: Thank you for accepting my request. My travel airport codes are LAS and SFO.

ASSISTANT: Can I know your travelling dates to check the flights availability?

USER: Sure, the planned journey dates are Jan/07 and Jan/09.

ASSISTANT: Do you need any specifications?

USER: Yes, I need a flight which is departing in the evening time.

ASSISTANT: Can I know your preferences please?

USER: I have a preference related to connection limit that should be 1.

ASSISTANT: Sorry, there are no flights found in our database.

USER: It's ok, not a problem with that. Anyways thank you for your time.

ASSISTANT: Thank you for reaching us.