You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Jonathan Davis here. I want to book a ticket from DFW to AUS, can you help me in booking a ticket?

ASSISTANT: Sure, may I know your planned travel dates to check for the flight availability?

USER: My journey dates are 02/12 to 02/14.

ASSISTANT: Sorry, there are no flights available for your desired dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.