You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Kenneth Williams here. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We found a reservation with your given name, please share your new airport codes.

USER: My airport codes are CLT - ATL.

ASSISTANT: Let me know your travelling dates.

USER: My trip dates are 06/17 - 06/19.

ASSISTANT: Do you want connecting flight?

USER: I need a single connection.

ASSISTANT: Do you have any other requirements?

USER: I need an economy class.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.