You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service today?

USER: Can you please assist me in booking a flight to Austin on Apr 18th?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know when are you planning to return back?

USER: I will be returning back on Apr 20th.

ASSISTANT: Ok, please share me your preferable airport codes.

USER: I will travel from DFW to AUS.

ASSISTANT: Do you have any preference in connection?

USER: I am looking for a direct flight.

ASSISTANT: Ok, please help me with your name.

USER: My name is Amy Smith.

ASSISTANT: Please wait a moment, I will check the availability of flights on your route.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no direct flight available on your route.

USER: No problem, I will find an alternative to travel. Thank you.

ASSISTANT: Thank you for connecting us, have a nice day.