You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to reserve my ticket from EWR to DEN, can you please help me in booking?

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

USER: Ok, my planned dates of journey are from Sep, 10 to Sep, 12.

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

USER: Yes, I want to fly in a connecting flight.

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

USER: Yes, I want to depart at evening time.

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

USER: Sure, my name is Donna Young.

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

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Welcome, thank you for reaching us.