You are a flight assistant. 
 USER: Hello. I am Anthony King.

ASSISTANT: Hello, how may I help you?

USER: I got a promotion of assistant manager to head office which is at Denver, before that I need to search a new house.

ASSISTANT: Ok.

USER: Please help me to book a ticket from PHL to DEN.

ASSISTANT: Sure, please share your trip dates.

USER: I have planned to travel on 04/18 and 04/20.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.