You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need you to book a flight ticket from LAS to DTW, please help me.

ASSISTANT: Sure, can I know your travelling dates?

USER: February 26 and 28, are my planned travelling dates.

ASSISTANT: On which name should I reserve the flight ticket?

USER: William Wright here.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need it.

ASSISTANT: Do you have any other specifications?

USER: I wish to depart in the evening.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.