You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Could you help me to amend my existing reservation?

ASSISTANT: Please share your name to proceed further?

USER: I am Samantha Nelson.

ASSISTANT: There is no active reservation found under your name to amend it.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.