You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Steven Moore.

ASSISTANT: How can I respond to your request?

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

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no current reservation found with name, Steven Moore.

USER: No issue. Thank you.

ASSISTANT: Thank you. Please visit again.