You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: I am Robert Baker. Can you help me to change my reservation?

ASSISTANT: Sure Baker, I will help you with that.

USER: Sure.

ASSISTANT: Sorry Robert Baker, no reservation has found under your name to change.

USER: Ok, no issues. Thank you for your help.

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