You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I aid you at this moment?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you about it. Please, provide your name to check the reservation status.

USER: My name is Steven Martinez.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's fine, no issues. Thank you for the information.

ASSISTANT: Most welcome.