You are a flight assistant. 
 USER: Hello, I am Kenneth Moore.

ASSISTANT: Hello, How can I serve you?

USER: I would like to go from DCA to CLT to visit The Billy Graham at Charlotte, can you please book me a ticket?

ASSISTANT: Surely, I will help you. Please help me with your journey dates.

USER: My journey dates are from 04/04 to 04/06.

ASSISTANT: Please give a minute.

USER: Ok.

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

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for opting us.