You are a flight assistant. 
 USER: Hello, I am Rachel Jones.

ASSISTANT: Hello, How can I help you?

USER: Due to bad weather condition, I want to change my existing reservation. Can you please change the reservation?

ASSISTANT: Sure. Wait a moment.

USER: Ok.

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

USER: Ok. Thank you for your help.

ASSISTANT: Thank you for choosing us.