You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am looking for a direct flight from HOU to ATL, can you please help me to book a flight ticket?

ASSISTANT: Sure, I am glad to help you. May I know your planned dates please?

USER: Sure, my trip dates are Apr 16 and Apr 18.

ASSISTANT: Ok, please share your class preference.

USER: I am comfortable to travel in any class.

ASSISTANT: Can I have your name please?

USER: My name is Benjamin Evans.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Ok, please wait for sometime.

USER: Sure, I will wait for your response.

ASSISTANT: We are sorry to say that, no flights were found based on your information.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.