You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Larry Smith. I planned to meet my cousin in BOS, can you please help me to book a flight ticket from DTW?

ASSISTANT: May I know tour trip dates?

USER: I prefer to travel on 04/10 and 04/12.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flights available on these date.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.