You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you help me to book a flight ticket from EWR to LAS?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: My preferable journey dates are June 16 and June 18.

ASSISTANT: Do you have a airline preference?

USER: I would like to prefer normal cost airline.

ASSISTANT: Please let me know if you have any other requirements.

USER: I prefer connecting flight.

ASSISTANT: May I know your name?

USER: My name is Donna Nelson.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.