You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you aid me to book flight ticket from DTW to LAX?

ASSISTANT: Sure, may I know your name please?

USER: I am Frank Allen.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My trip dates are Feb 21 and Feb 23.

ASSISTANT: May I know your class preference please?

USER: I prefer  economy class to travel.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Sorry Allen, there is no flight found as per your travelling dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.