You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Please help me to book a flight ticket from DEN to SEA?

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

USER: My journey dates are June 11 and June 13.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I prefer departure time at evening.

ASSISTANT: Can you please share your good name?

USER: I am Nicholas Hill.

ASSISTANT: Sorry, there are no flights found on your specified requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.