You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know on which dates you are willing to travel?

USER: My travelling dates are 25 to 27 of May.

ASSISTANT: For further proceeding, may I know your good name?

USER: I am William Clark.

ASSISTANT: If you have any specifications please let me know, I'll check availability of flights according to that?

USER: I need a connecting flight.

ASSISTANT: Sorry to inform you that, there is no flight found as per your travelling dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.