You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I am Justin Lopez.

ASSISTANT: Ok.

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

ASSISTANT: Sure, please wait for a while. I will check your status and revert you.

USER: Ok.

ASSISTANT: Thanks for being patient, we did not find any active reservation on your name.

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

ASSISTANT: Thank you for reaching us.