You are a flight assistant. 
 USER: Hello, James White here.

ASSISTANT: Hello. How can I help you?

USER: I planned to visit Denver Botanic gardens, can you please help me to book a flight ticket from PHL to DEN?

ASSISTANT: Definitley, can you please provide your travel dates for booking flight ticket?

USER: I prefer to travel on 03/01 and 03/03.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry James no flights available as per your requested dates.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for contacting us.