You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Myself Lisa Nelson. I am very excited as this trip is very special, I am going to hangout with my school friends after a long time.Can you please book a ticket from DTW to SEA?

ASSISTANT: Sure, I can help you with that. Lisa, can you please help me with your travelling dates?

USER: I would like to travel on 04/19 and return on 04/21.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok sure.

ASSISTANT: Lisa, I am sorry to inform you that there is no reservation found under your name. There is no flight available at your request.

USER: That's ok. Thank you.

ASSISTANT: You are welcome.