You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Unfortunately my exams was postponed so I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, may I know your good name?

USER: Myself Rachel Harris.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for connecting us.