You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, May I know your name?

USER: Sure, my name is Scott Collins.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.