You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, when do you want to travel?

USER: I want to travel on Apr 15 and Apr 17.

ASSISTANT: Ok, May I know your good name?

USER: My name is Jonathan Green.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, Do you have any other preferences?

USER: I need single connection.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any flights with your given details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.