You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me book a flight ticket from Dallas & Fort Worth, TX - DFW to attend a meeting at Austin, TX - AUS?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I need to fly on 12/08 and 12/10.

ASSISTANT: May I know your name please?

USER: My name is George Lee.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.