You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Wright.

ASSISTANT: How may I aid you?

USER: I am planning to book a ticket from LAS to DEN. Can you please help me out?

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

USER: I am planning to travel on June 26 and return back on June 28.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am ok with any airline.

ASSISTANT: Do you have any specific departure and arrival time?

USER: My depart time should be evening.

ASSISTANT: Which class do you prefer to travel?

USER: I am ok with any class.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.