You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Martin.

ASSISTANT: Ok, Martin can you please tell me how can I assist you?

USER: I am planning to visit a Willis tower in Chicago.Can you please help me out to book a ticket from CLT to ORD?

ASSISTANT: Ok, I can help you with that. mean while can you please tell me when you are planning to start and end your journey?

USER: My travelling dates are 04/19 to 04/21.

ASSISTANT: Ok, thank you for sending your details.Please wait for a minute I will check let you know about your flight details.

USER: Make sure my connection limit is 1. Ok.

ASSISTANT: Thank you for waiting, I found a flight ticket with AA airline matches with your requirements.

USER: That's great.

ASSISTANT: May I proceed to book?

USER: Sure, please proceed the booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: Most welcome.