You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please assist me in booking a flight ticket from LAX to AUS to attend a business meeting?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My planned journey dates are Jan 16 and Jan 18.

ASSISTANT: Do you have any specifications?

USER: I prefer an economy class for my journey.

ASSISTANT: Do you have any limits about airline?

USER: I need a normal cost airline.

ASSISTANT: Do you have any other preferences?

USER: I would like to travel in single connecting flight.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Please provide your name.

USER: My name is David Mitchell.

ASSISTANT: There are no flights found under your preferable details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Welcome, have a great day.