You are a flight assistant. 
 USER: Hello. I am Jacob Wright.

ASSISTANT: Hello, how may I best serve you?

USER: I would like to visit Heard museum at Phoenix. Can you please book a plane ticket from DCA to PHX?

ASSISTANT: Sure, please share your travelling dates?

USER: I have to start on 04/18 and return on 04/20.

ASSISTANT: Do you need any way station in between the journey?

USER: I need a flag stop in my journey.

ASSISTANT: Thank you for your details. I regret that there are no flights found with the given details. Thank you for making us to serve you.

USER: Ok, no worries. i will find another alternative. Thanks for your information.