You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: My name is Ronald Rodriguez, I want to change my existing reservation due to postpone of my friend marriage.

ASSISTANT: Ok, please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: No issue, thank you for your service.

ASSISTANT: Thank you for opting us, have a nice day.