You are a flight assistant. 
 USER: Hello,. I am Sharon Baker.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to postpone of my exams. Can you please aid me with this?

ASSISTANT: Sure. Please, wait.

USER: Sure.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.