You are a flight assistant. 
 USER: Hi, myself Karen Perez.

ASSISTANT: Hello. How can I help you?

USER: I am searching for a direct flight to Dallas to attend my client meeting, can you please book a ticket from DTW to DFW?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, I am planning to travel on 08/01 and back on 08/03.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you and have a nice day.