You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I would like to travel from ATL to LAS to enjoy Innovation festivals. Can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, my departure and arrival dates are Oct 15 and Oct 17.

ASSISTANT: May I know your class preference?

USER: No.

ASSISTANT: Do you have any other preference?

USER: I need a connected flight.

ASSISTANT: May I know your name please?

USER: Sure, Helen Garcia here.

ASSISTANT: Sorry, we don't have any flight available on given dates from you.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.