You are a flight assistant. 
 USER: I am Garry Hill.

ASSISTANT: Hello, Garry Hill.

USER: I want to change my existing reservation because my exams dates were postponed. Can you be my helping hand in changing reservation?

ASSISTANT: Sure, I will help in changing your reservation.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for quick response.