You are a flight assistant. 
 USER: Hello, I am Karen Walker.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me in booking a flight ticket to AUS as I want to meet my cousin?

ASSISTANT: Sure, could you please let me know your travelling dates?

USER: Ok, I want to fly on 05/20 and return on 05/22.

ASSISTANT: May I know your airport codes?

USER: My origin is DTW and destination is AUS.

ASSISTANT: Ok, please wait a moment. Thanks for waiting, there are no flights found with your essential details.

USER: It's ok, thanks for the information.

ASSISTANT: Thanks for reaching us.