You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how could I aid you today?

USER: I would like to change my existing reservation, because I need to change my residence and office to other place. Will you help me in this?

ASSISTANT: Can I have your name please?

USER: I am Debra Wilson.

ASSISTANT: We are sorry to notify, we did not found any reservation on your given name.

USER: Ok,. Thank you.

ASSISTANT: Thank you for reaching us help.