You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Please help me to book a flight ticket from DTW to PHX.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My travel dates are from Apr, 16 to Apr, 18.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: No, I do not have.

ASSISTANT: Do you have any other specifications?

USER: I need a single connecting flight.

ASSISTANT: Can I have your good name please?

USER: Timothy Johnson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Timothy Johnson, no flight is available to you on your dates.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us, have a great journey.