You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please check for the flights from DCA to AUS?

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

USER: My journey dates are from July 18 to July 20.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: I am Margaret Lopez.

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

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Welcome, have a great day.

USER: Most welcome.