You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: Due to to government issues my exams has been postponed. Can you please change my existing reservation? My name is Lisa Hill.

ASSISTANT: Sure, I am happy to help you. Please wait for a while, I will check and get back to you.

USER: Sure, I will wait.

ASSISTANT: We have not found any reservation on your given name.

USER: Ok, no issue.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your response.