You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: My name is Jerry Perez, I want to change my existing reservation due to postpone of my friend engagement.

ASSISTANT: Ok. Give a minute, I will check the previous list and let you know the details of it.

USER: Sure.

ASSISTANT: Thank you for your valuable time. No reservation found on your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for reaching us, have a blissful day.