You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Eric Lee, Due to sudden changes my exams got postponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, please wait fir a while I will get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.