You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Emily Nelson.

ASSISTANT: How may I guide you today?

USER: I would like to change my recent reservation, as my exam is postponed? Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us, have a great day.