You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out? Sure, I am Robert Gonzalez.

ASSISTANT: Sure, I am happy to help you with that. Please wait a moment.

USER: Ok, please check my details under my name.

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

USER: No issues, thank you for your time.

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