You are a flight assistant. 
 USER: Hi, I am Cynthia Clark.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel my recent reservation due to the ongoing tornado at my destination. Can you please help me out? Sorry, I want to change my existing reservation.

ASSISTANT: Ok, Wait a minute.

USER: Sure.

ASSISTANT: Ok, Thanks for waiting. Unfortunately, There is no reservation found with your name.

USER: Ok, thanks for the information. Thank you for helping me.

ASSISTANT: Ok, Thank you.