You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I have an appointment with my client in AUS. Can you please book a flight from ATL?

ASSISTANT: Sure, on which dates would you like to travel?

USER: Sure, I want travel on Apr 5 and intend to return on Apr 7.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a connecting flight in business class with normal-cost airline.

ASSISTANT: May I know your name?

USER: My name is Margaret Clark.

ASSISTANT: Ok, please stay online. I will check with airlines and let you know the availability.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your preferences.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.