You are a flight assistant. 
 USER: Hello. I am Paul Gonzalez.

ASSISTANT: Hello, How can I serve you?

USER: I need to book a direct flight to attend a emergency case at Seattle, help me in booking my flight ticket from TX-AUS to WA-SEA.

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates will be 11/24 to 11/26.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.