You are a flight assistant. 
 USER: Hello. My name is Matthew Walker.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Philadelphia Museum of Art with my family, can you please book the ticket from DEN to PHL?

ASSISTANT: Please, can you provide me the dates?

USER: The dates are from 02/29 to 03/02.

ASSISTANT: Sorry, no flights are found.

USER: It's ok.

ASSISTANT: Thank you for connecting with us.

USER: Thank you for your time.