You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Will you help me in booking the flight ticket from SEA to DEN?

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

USER: My travelling dates are Nov 23 and Nov 25.

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

USER: I need a direct flight in normal-cost.

ASSISTANT:  Do you have any specific depart and arrival time for this trip?

USER: No, thank you for asking.

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

USER: Myself Jonathan White.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, thank you for reaching us.