You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Nicole Turner an I want to change my existing reservation due to sudden changes in the dates of summit which was going to be held in the place where I suppose to visit,. Can you help me?

ASSISTANT: Sure, we are here to help you. Just wait a moment, I will check your details and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation exist on your name.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for consulting us.