You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am planning to travel from OAK to DTW, can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, my journey dates are July 29 and July 31.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Steven Miller.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: You are welcome, have a nice day.