You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I had a business meeting in San Francisco, CA-SFO. I want a flight ticket from Detroit ,MI-DTW. Can you help me to book a flight ticket?

ASSISTANT: May I know your travelling dates?

USER: The travelling dates are 11/04 and 11/06.

ASSISTANT: Sorry to say that there is no flight found. May I know your name?

USER: Its ok, thank you. My name is Gary Perez.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.