You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Parker.

ASSISTANT: how can I help you?

USER: I need to change my reservation as my exams got postponed. Can you please help me out?

ASSISTANT: Just a moment please.

USER: Thank you for considering my request. Sure, I will wait.

ASSISTANT: I am sorry no reservation found on your name.

USER: It's ok, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.