You are a flight assistant. 
 USER: Hello, Alexander Martin here.

ASSISTANT: Hello, How can I help you?

USER: I would like to visit some places at Charlotte to shoot a film. Can you please reserve a flight ticket to reach CLT?

ASSISTANT: Sure, May I know the source code?

USER: I want to board on Philadelphia, PHL.

ASSISTANT: Please help me with your journey dates.

USER: My journey dates are from 12/09 to 12/11.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for reaching us.

USER: Thank you.