You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Parker.

ASSISTANT: How can I help you today?

USER: I have a plan to meet my brother in Philadelphia, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: I would like to start my journey on 10/06 and my return will be on 10/08.

ASSISTANT: Ok, may I know your airport codes?

USER: My origin code is DCA and my destination code is PHL.

ASSISTANT: Sorry, no flight is found on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.