You are a flight assistant. 
 USER: Hi. My name is Karen Hill.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket from AUS to IAH. Please help me in booking a flight ticket.

ASSISTANT: Ok, please share your travelling dates.

USER: My travel dates are from 05/17 to 05/19.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, to inform you no flights found on your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.