You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Christine Campbell. I need to change my existing reservation due to my exams, could you help me?

ASSISTANT: Sure, give me a minute.

USER: Sure.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for opting us.