You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Thomas Robinson. Due to sudden changes, my exams has been postponed. Can you please help me to change my reservation?

ASSISTANT: Sure, please hold on a moment.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found on your name to change it.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for contacting us.