You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emily Thompson here.

ASSISTANT: Emily, how can I assist you?

USER: Can you please help me out in booking the ticket from Dallas to New York? As I'm planning to visit Statue of Liberty.

ASSISTANT: Sure, I am here to help you. May I know on which dates you want to travel?

USER: Sure, I want to depart from here on 09/16 and return by 09/18.

ASSISTANT: Please provide your origin and destination airport codes.

USER: Ok, my source airport code is DFW and my destination airport code is EWR.

ASSISTANT: Please hold on for a while.

USER: Sure, I'll wait.

ASSISTANT: Sorry Thompson, no flight is available on your route.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for opting us.