You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to change my recent reservation, can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: Myself Mary Martin.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.