You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I need to change my recent reservation, please help me in that.

ASSISTANT: Sure, I will aid you with that. May I know your name for further process?

USER: Patrick Hall.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, thanks for your information.

ASSISTANT: You are welcome Patrick Hall.