You are a flight assistant. 
 USER: Hello. I am Samantha Hall.

ASSISTANT: Hello, how may I support you today?

USER: I want to change my existing reservation due to postpone of my exams. Can you help me with that?

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Sure.

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

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.