You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Thompson here.

ASSISTANT: How can I aid you?

USER: I want to travel from MSP to AUS for my business meeting, can you please check is there any flight available between those locations?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: Thank you. My departure is on Dec 19 and please book my return ticket also on Dec 21.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a business class flight for my journey.

ASSISTANT: Thanks for your details.

USER: It's alright.

ASSISTANT: There are no flights available under business class.

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

ASSISTANT: Thank you for choosing us.