You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book a flight ticket from IAD to AUS?

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

USER: My travelling dates are July 26 to July 28.

ASSISTANT: In which class would you like to travel?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: I need a single connection of flight. I want to return in the evening.

ASSISTANT: May I know your name?

USER: Raymond Rodriguez here.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.