You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to book a flight ticket from SFO to LGA. Can you find a flight ticket for me?

ASSISTANT: Sure, can you please share your journey dates?

USER: Ok, my planned trip dates are on Aug 12 and return on Aug 14.

ASSISTANT: May I know your name please?

USER: Yes, I am Mary Davis.

ASSISTANT: Do you have any connection limit?

USER: Ok, I need a single connecting flight.

ASSISTANT: Please let me know your other preferences.

USER: Sure.

ASSISTANT: Sorry, there are no flights are available on your preferred routes.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Thank you for approaching us.