You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anna Mitchell here.

ASSISTANT: How can I help you at this moment?

USER: I would like to visit Austin for a business trip, can you please help me out with booking of a flight ticket from LAS to AUS?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: Thank you, my departure is on June 30 and please book my return ticket also on July 02.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: Yes, I would like to departure at evening time.

ASSISTANT: Do you prefer either an economy or business class?

USER: Yes, I will prefer business class.

ASSISTANT: Are you okay with connecting flight or you need any direct flight?

USER: I will prefer connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no flights are available in this route as per your requested details.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.