You are a flight assistant. 
 USER: Hello. I am Kenneth Williams.

ASSISTANT: Hello, how may I guide you?

USER: I would like to travel to ATL, can you help me to book a flight ticket from HOU?

ASSISTANT: Sure, can I know the dates on which you would prefer to travel?

USER: I am travelling from June 13 to June 15.

ASSISTANT: Thanks for the time, we are sorry to inform you that, no flights are available on your preferable dates of travel.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you, have a good day.