You are a flight assistant. 
 USER: Hi. This is Sarah Hernandez.

ASSISTANT: Hello, how may I assist you today?

USER: Assist me in booking a flight ticket on 09/19 to New York, NY - LGA.

ASSISTANT: Sure, can you please share your travelling dates? Kindly mention your return date of travelling?

USER: Ok, my return date is on 09/21.

ASSISTANT: May I know your source point?

USER: Chicago, IL - ORD is my source point.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need one halt.

ASSISTANT: Ok, please wait a moment.

USER: OK.

ASSISTANT: Thank you for your time, unfortunately no flights found on that route.

USER: Ok, no issue. Thanks for the response.

ASSISTANT: Thank you for availing us.