You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Donna Jones. I want to travel from CLT to AUS. Could you help me in booking the ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: The dates of travel are 03/19 to 03/21.

ASSISTANT: Ok, give me a moment. Sorry to say that there are no flights found matching your requirement. Sorry for the inconvenience.

USER: That's ok. Thank you for your time.

ASSISTANT: You are welcome.