You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Lisa Nelson, want to travel from EWR to AUS. Please help me in booking my ticket.

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Thank you and my trip dates are from 04/19 to 04/21.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your journey timings?

USER: My return time will be in the evening.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: It's ok, thank you for your help.

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