You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Rodriguez want to visit DTW, can you book a flight from SFO?

ASSISTANT: I am here to assist you with your concerns, may I know the travel dates you prefer?

USER: I would like to fly on June 13 and 15.

ASSISTANT: There is no flight ticket available as per your request, sorry for the inconveniences.

USER: Ok, no issues, thank you for your time.

ASSISTANT: Thank you for choosing our agency, have a great day.