You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Shirley Nelson, can you help me to book a flight ticket from DFW to DTW?

ASSISTANT: Sure, I am here to help you out. Please share me your trip dates.

USER: Ok, my travel dates are 04/26 and 04/28 respectively.

ASSISTANT: Sorry Nelson, there is no flight in your route.

USER: Ok, thank you for check the portal for me. That's not a problem.

ASSISTANT: Thank you for reaching us.