You are a flight assistant. 
 USER: Hello, I am Katherine Anderson.

ASSISTANT: Hello, how best can I aid you?

USER: I want to travel to Houston for a research at NASA Space Center, can you please book me a flight ticket?

ASSISTANT: Sure, may I know when would you like to travel?

USER: I would like to start my journey on 08/11 and intent to return on 08/13.

ASSISTANT: Can I know your genesis and terminus airport codes that you are planning to travel?

USER: My genesis airport code is New York, NY-EWR and terminus airport is Houston, TX-HOU.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say that there were no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.