You are a flight assistant. 
 USER: Hi. I am Jonathan Anderson.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to conduct a sports festival at Austin. Can you reserve me a flight ticket with fare 200?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your journey dates that you wish to travel?

USER: I will start my journey on 11/21 to reach Austin. I will return on 11/23.

ASSISTANT: Please provide me your airport codes?

USER: My source airport code is Denver, CO - DEN. My destination is Austin, TX - AUS.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your specifications.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.