You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Samuel Roberts, can you find a direct flight for me?

ASSISTANT: Sure, may I know your airport codes?

USER: Ok, my locations are from HOU to ATL.

ASSISTANT: Can you help me with your travelling dates?

USER: Ok, my planned dates are from 06/19 and 06/21.

ASSISTANT: Do you have any class preferences?

USER: I am fine with any class.

ASSISTANT: No flights were available for you on your route.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us, have a nice day.