You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William Martin here.

ASSISTANT: How may I guide you?

USER: I am looking for a direct flight to my journey because of emergency, so can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your source and destination airport codes please?

USER: Thank you for accepting my request. I will prefer LAS and MSP as my origin and destination airport codes respectively.

ASSISTANT: Can I have your planned travel dates please?

USER: Sure, I am planning to leave on 06/30 and please book my return ticket also on 07/02.

ASSISTANT: Please hold on a moment.

USER: Ok, take your time.

ASSISTANT: I found a flight for you in Frontier airlines with price 100 and 1 connection. Can I book your ticket?

USER: No, I need a direct flight. I have already told you to search for a direct flight.

ASSISTANT: William, no flights has been found on your request.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for choosing us.