You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to my seminar has been postponed. Can you please help me?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: On whose name, the reservation has been made earlier?

USER: Please check my reservation on the name of Jacob Garcia.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your given name.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for reaching us.