You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a ticket from AUS to SFO to attend workshop, can you help me in booking?

ASSISTANT: Sure, when are you planning to start and return on?

USER: I am departing on Apr 16 and return on Apr 18.

ASSISTANT: Do you need a connecting flight?

USER: I prefer a direct flight.

ASSISTANT: Can I know your good name?

USER: My name is Thomas Garcia.

ASSISTANT: Do you have any other specifications?

USER: I do not have any specifications.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.