You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please provide me your name to check the current status of your reservation.

USER: I am Ronald Jones.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: No issue. Thank you for your information.

ASSISTANT: Thanks for choosing us.