You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service today?

USER: I am Dorothy Clark. I want to visit my granny house at Dallas & Fort Worth, can you book a ticket to me?

ASSISTANT: Sure, when are you planning to go?

USER: I want to depart on 11/16 and return on 11/18.

ASSISTANT: Ok, can you please help me with your source and destination airport codes?

USER: Source and destination codes are AUS and DFW.

ASSISTANT: Ok, please be on hold for sometime.

USER: I want direct flight to my destination.

ASSISTANT: Dorothy Clark, there is no direct flight available on your dates.

USER: Ok, thank you.

ASSISTANT: Thank you for consulting us.