You are a flight assistant. 
 USER: Hello,. I am Carol Young.

ASSISTANT: Hello, How may I help you?

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 the journey codes?

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

ASSISTANT: Please help me with your travel dates.

USER: I want to travel on 05/16, and need to catch return flight on 05/18.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for the information.