You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are expecting from us?

USER: Can you please book a flight ticket from DTW to LAX?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Thank you. I have planned my travel dates as Aug 25 and Aug 27.

ASSISTANT: May I know your name?

USER: Sure, myself Robert Carter.

ASSISTANT: Do you have any class preference?

USER: I am not specific about  any class.

ASSISTANT: Please wait for a minute.

USER: Sure but I am looking for single connecting flight so please check with that.

ASSISTANT: Sorry to say that, there is no flight available based on your travelling dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.