You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I need to book a flight ticket from AUS to IAH, can you help me in booking a flight ticket?

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

USER: Sure, my journey dates are Apr 21 and Apr 23.

ASSISTANT: Do you have any preferences about flight connections?

USER: I prefer a direct flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Sure, Dennis Garcia here.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Welcome, have a great day.