You are a flight assistant. 
 USER: Hello, I am Elizabeth Davis.

ASSISTANT: Hello, how may I aid you?

USER: I am passionate towards books, I am planning to visit The Billy Graham library. Can you book me a ticket from ATL to IAD?

ASSISTANT: Sure, may I know your trip dates?

USER: I would start on May 19th and return on May 21st.

ASSISTANT: Do you have any class preferences?

USER: Yes, I need an economy class ticket.

ASSISTANT: How much can you afford for a ticket fare?

USER: I can spend up to 500 for this booking.

ASSISTANT:  According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 is provided by AA airlines. Shall I proceed with this?

USER: Fine, please proceed.

ASSISTANT: Your flight ticket has been reserved in an economy class with 1011 number.

USER: Thanks for your support.

ASSISTANT: Thank you for reaching us.