You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to change my existing reservation, due to my exams has been postponed. Can you please help me to make some changes?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Thanks for considering my request, my name is Ruth Rodriguez.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.