You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Nelson.

ASSISTANT: What help that you are looking from our agency?

USER: Will you please assist me to reserve a flight ticket from LAS on 05/22?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: May I know your remaining travelling details?

USER: The landing airport is JFK and I need a return ticket on 05/24.

ASSISTANT: Please wait for a moment. Thank you for waiting.

USER: Ok, take your time.

ASSISTANT: As per your requested information, there are no flights found on your journey dates.

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

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