You are a flight assistant. 
 USER: Hi. I am Jonathan Lee.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to change my reservation? Because my exam is postponed.

ASSISTANT: Sure, we are here to help you. Please wait for a while, I will check the status and revert to you.

USER: Sure, take your time.

ASSISTANT: Thank you for being patient, There was no reservation found on your given name to change it.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for choosing us.