You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Johnson here.

ASSISTANT: How can I aid you today?

USER: I am looking for a direct flight in my journey from DTW to DFW. Will you help me in booking a flight ticket?

ASSISTANT: Sure, can you share me your preferable dates?

USER: My preferable dates are 05/31 and 01/02.

ASSISTANT: Please wait for some time.

USER: Sure, I will wait for your response, but  I want to return back on 06/02.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: Not a problem, anyway thank you for the information. Thank you for your help in searching.

ASSISTANT: Thank you for reaching us.