You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Elizabeth Turner.

ASSISTANT: How can I assist you?

USER: Can you please book a flight ticket in business class to attend a meeting with client in Atlanta?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: I want to start on Mar 30th and need to catch return flight on Apr 1st.

ASSISTANT: Give me a moment. Can you tell me your nearest airport codes?

USER: Sure, please check the flights availability with normal-cost airlines.

ASSISTANT: Ok.

USER: My airport codes are, OAK to ATL.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.