You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me in booking flight ticket from LAS to DTW.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are June 9 and June 11.

ASSISTANT: Do you have any limits on number of connections?

USER: I want single connection.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: May I know your name for the booking process?

USER: I am Melissa Roberts.

ASSISTANT: Sorry, no flights are available on your required dates.

USER: Ok, Thank you.

ASSISTANT: Welcome, thank you for reaching us.