You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: My name is Linda Young. Please help me to book a flight ticket from DTW to HOU.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I will travel on Aug 20th and 22nd.

ASSISTANT: Do you have any airline preferences?

USER: No, I don't have any airlines preference.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I want to return in the afternoon time.

ASSISTANT: Sorry, there are no flights available at your request.

USER: No problem, thank you for the information.

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