You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I would like to visit IAD, can you book a ticket from AUS?

ASSISTANT: Sure, provide your travel dates.

USER: My travel dates are 10/21 and 10/23.

ASSISTANT: Let me check is there any flight available, mean while please provide your name.

USER: I want to book a ticket in the name of Elizabeth Lopez.

ASSISTANT: There is no flight available, Lopez. Thanks for contacting us.

USER: No problem. Thank you for checking.

ASSISTANT: Have a nice day.