You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: May I know your name?

USER: My name is Emma Harris.

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

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you.