You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Stephanie Lopez, can you help me to book a flight ticket from DTW to IAD?

ASSISTANT: Sure, I will help you. Can you please provide me your trip dates?

USER: Ok, please book for the dates 02/16 and 05/18.

ASSISTANT: Ok, please wait for a while.

USER: Ok, not a problem. Take your time.

ASSISTANT: Sorry Lopez, there is no flight available on your preferred travel dates.

USER: That is ok, thank you for assisting me.

ASSISTANT: You are welcome and thank you for choosing us.