You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kevin Edwards here.

ASSISTANT: How could I serve you today?

USER: Can you book a flight ticket for my airport codes that is from AUS to IAD?

ASSISTANT: When you are planning to travel?

USER: The travel dates are from Oct 29 to Oct 31.

ASSISTANT: Please share me the timings of travelling.

USER: The return time would be afternoon.

ASSISTANT: Do you need any connecting flight or direct flight?

USER: I need a single connecting flight.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.