You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I want to change my existing reservation due to postpone of my exams. Can you please help me in that?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

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

USER: Elizabeth Young.

ASSISTANT: Please stand by.

USER: Ok.

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

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.