You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have planned to book a flight from LAX to AUS, so please help me in booking a flight.

ASSISTANT: Sure, please help me with your journey dates.

USER: My planned dates are on July 20th to 22nd.

ASSISTANT: Ok, May I know your airline preference?

USER: I prefer a normal-cost airline.

ASSISTANT: Ok, Do you have any class preference?

USER: Yes, I wish to travel in business class.

ASSISTANT: Ok, May I know your name?

USER: Sure, my name is Michael Gonzalez.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your patience, There were no flights found with your given details.

USER: No worries, thank you.

ASSISTANT: Thank you for opting us.