You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Carolyn Jones.

ASSISTANT: How can I help you?

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

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, not an issue.

ASSISTANT: Thanks.

USER: Thank you for giving information.