You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I want to change my reservation due to postponed of my exam, so please aid me in changing.

ASSISTANT: Sure, I am here to aid you.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sure, my name is Joshua Evans from Dallas & Fort Worth.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your name in our database.

USER: No issues, thanks for your assistance.

ASSISTANT: Thank you for reaching us.