You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Williams.

ASSISTANT: How can I assist you?

USER: I want to travel from SEA to DTW. Can you help me to book a flight ticket?

ASSISTANT: Sure, can I know your travel dates?

USER: I want to travel on 12/14 and 12/16.

ASSISTANT: Please give me a minute. Williams, there is no flight available on your request.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are welcome.