You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to sudden postpone of my exams dates. Can you help me out?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: I am Margaret White.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for approaching us.