You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me in booking a flight ticket from DCA to AUS?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to travel on 02/04, and return on 02/06.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a single connection.

ASSISTANT: Do you have any air line preference?

USER: Yes, I prefer for normal cost airline.

ASSISTANT: Thank you, may I know your name for the documentation purpose?

USER: I am Brandon Scott.

ASSISTANT: Do you have any class specification?

USER: No, but I want to return in the evening time.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Welcome, thank you for reaching us.