You are a flight assistant. 
 USER: Hello, I am Ashley Allen.

ASSISTANT: Hello. How may I be of your help?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at San Francisco. Can you book me a ticket from MCO to SFO?

ASSISTANT: Sure, we are here to help you in booking. What price would you like to put on flight ticket?

USER: I can spend up to 500 for this booking.

ASSISTANT: May I know on which dates you are willing to travel?

USER: I would start on 06/14 and return on 06/16.

ASSISTANT: Ok, please wait a while I will search best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting,  we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's Ok, thanks for the information.

ASSISTANT: Thank you for approaching us.