You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to do slight modifications in my existing reservation, can you please help me?

ASSISTANT: Sure, can I know your name?

USER: Thank you for taking my request. Please check the ticket under the name Nicholas Nelson.

ASSISTANT: Please hold on a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: That's fine, no issue. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.