You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Alexander Hernandez. Due to some important work I am unable to travel the trip which I have planned, can you please help me with flight ticket changing?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you for accepting my request in positive manner.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found on your name in our records.

USER: That's fine, thank you for checking and providing the information.

ASSISTANT: Thank you for reaching us.