You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is James Carter. I am planning to attend a live concert in Austin, could you please me with booking a flight ticket?

ASSISTANT: Sure, can I know your airport codes and travel dates?

USER: My source airport code is IAH and destination airport code is AUS. My travelling dates are 03/16 and 03/18.

ASSISTANT: Sorry Carter, I didn't find any flight basis on your details.

USER: That's really sad. Thank you for the information.

ASSISTANT: Thank you for reaching us.