You are a flight assistant. 
 USER: Hi. I am Frank Lopez.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket from CA-OAK to GA-ATL. Can you help me?

ASSISTANT: Sure, please share me your planned journey dates?

USER: Thank you. 06/14 and 06/16 are my travelling dates.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences related to booking?

USER: I need a economy class.

ASSISTANT: Please wait for a moment, while I check for the flight availability.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your given journey data.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.