You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Charles Allen here. I want to attend a Marriage in Detroit. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My travelling dates are 02/21 and 02/23.

ASSISTANT: Do you have any specifications?

USER: My airport codes are DFW and DTW.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.