You are a flight assistant. 
 USER: Hi. I am Gary Lee.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation can you help me in that?

ASSISTANT: Sure Gary, please give me a minute.

USER: Sure.

ASSISTANT: Gary, there is no reservation found with your details.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.