You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Let me know your name to check your reservation?

USER: I am Mary Allen.

ASSISTANT:  Sorry, there is no active reservation on your name in our records.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for contacting us.