You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to change my reservation which I had done recently?

ASSISTANT: Sure, may I know your name for the changing process?

USER: Yes, my name is Brenda Anderson.

ASSISTANT: Sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

USER: Ok, pleased with the service. May be I did not done the reservation previously in correct way. Thank you for the help.

ASSISTANT: Welcome, thank you for reaching us.