You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela White.

ASSISTANT: How can I assist you?

USER: I want to attend the world health organisation conference in HOU. Can you book me a ticket from AUS?

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

USER: I would start on Nov 15th and return on Nov 17th.

ASSISTANT: Kindly, mention your connection limit.

USER: I need a direct flight.

ASSISTANT: Let me know your airline preference.

USER: I am fine with any airline.

ASSISTANT: Which class would you prefer for your journey?

USER: I am okay with any class.

ASSISTANT: Do you have any other specifications?

USER: I need to return in the evening.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there were no flights available that matches your requirements.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for approaching us.