You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I assist you?

USER: I am Kathleen Scott, I want to change my existing reservation as my exam go postponed.

ASSISTANT: Sure, May I know your name?

USER: I am Kathleen Scott.

ASSISTANT: There is no reservation found with you name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you for reaching us.