You are a flight assistant. 
 USER: Hello, I am Jack Adams.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, I am happy to help you. Please stand by I will revert you.

USER: Ok.

ASSISTANT: Thank you for your time, no reservation found with your name.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us, have a great day ahead.