You are a flight assistant. 
 USER: Hi. I am Daniel Robinson.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, give me a minute for checking.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.