You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Will you book a flight ticket from EWR to LAS?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable departure and return dates of travelling?

USER: June, 22 and June, 24 are my journey dates.

ASSISTANT: Ok, on whose name I have to reserve the flight ticket?

USER: Jeffrey Lopez here.

ASSISTANT: Are you ok with connecting flight?

USER: Yes, I am fine with connecting flight.

ASSISTANT: Any more specifications do you have?

USER: I need to return at evening time.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: We are apologize that, there are no flights running towards your region with your requested preferences.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.