You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking my flight ticket from PHL to DEN?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: My trip dates are May 25 and 27.

ASSISTANT: Please help me with your name.

USER: Myself Lisa Jones.

ASSISTANT: Do you need a break in your journey?

USER: I need direct flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: There is no flights found under your preferable details.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us. Have a great time.