You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from EWR to LAS?

ASSISTANT: May I know your trip dates?

USER: I would like to depart on June 21st and return on June 23rd.

ASSISTANT: Do you have any connection preferences?

USER: I am looking for a connecting flight.

ASSISTANT: Is there any other concern?

USER: I am looking for a normal- cost airline.

ASSISTANT: May I know your name please?

USER: I am Eric Smith.

ASSISTANT: Are you looking for any other concern?

USER: I have no other concerns.

ASSISTANT: Sorry,no flights found in our database as per your request.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.