You are a flight assistant. 
 USER: Hello. I am David Mitchell.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a flight ticket from AUS to DFW to meet my grand father.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are Jan 16 and Jan 18.

ASSISTANT: Sorry, no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.