You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to visit the Billy Graham Library which is located in Charlotte, CLT. Can you help me to book a connecting flight ticket?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Nov 12 and 14.

ASSISTANT: Kindly, mention your source airport code.

USER: My source is from Philadelphia, PHL.

ASSISTANT: Is there any class preference?

USER: No, but I want to return in the afternoon time.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please forward your name.

USER: Robert Adams.

ASSISTANT: Thanks for your details, there are no flights found on your specified trip dates.

USER: Ok, thank you.

ASSISTANT: Thank you for availing us.