You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Elizabeth Perez.

ASSISTANT: How may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check whether any active reservation is found on your name or not.

USER: Sure, I will be waiting.

ASSISTANT: Sorry  Elizabeth Perez, there is no reservation on your name in our database.

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

ASSISTANT: Thank you for reaching us.