You are a flight assistant. 
 USER: Hello, Margaret Baker here.

ASSISTANT: Hello, how can I best address you today?

USER:  I am a Guitarist want to visit Philadelphia for celebrating Music festival, can you please book me a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to travel on 04/14, and need to catch return flight on 04/16.

ASSISTANT: Can you please let me know your airport codes?

USER: I need to leave from my nearest airport DCA to reach PHL.

ASSISTANT: Do you need any other specifications?

USER: I need a halt in between my journey.

ASSISTANT: OK, just give me a moment please.

USER: Sure.

ASSISTANT: Unfortunatley, there is no flight found on your journey details.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thanks for opting us, have a great day.