You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your helping hand?

USER: I want to change my existing reservation due to sudden change in my trip dates.

ASSISTANT: Ok.

USER: Can you help me in doing that?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: May I know your name to check in the reservation list for the changing process?

USER: I am Nicole Green.

ASSISTANT: Please wait a while I will revert to you with the current status.

USER: Sure, I will wait.

ASSISTANT: We are happy to inform you that, there is a reservation found in your name. Can you please provide me your journey details?

USER: I will fly from CLT my nearest airport to reach MSP. My trip dates are 02/23 and 02/25.

ASSISTANT: Thank you for your details, there are no flights available in your preferable dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.