You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my recent reservation, Can you please help me in that?

ASSISTANT: Yes, can you tell me your name?

USER: My name is Patricia Carter.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.