You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am George Mitchell.

ASSISTANT: How can I oblige you today?

USER: Due to sudden changes in the dates of summit which was going to be held in that place.So I want to cancel my reservation. Can you please help me?

ASSISTANT: Sure, we are here to help you in cancelling your reservation. Please, stay online.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation exists with your name in our reservation list.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.