You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: Owing to an emergency I had to request for this change reservation, can you please help me in that?

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your  ticket. Can I know your name please?

USER: My name is James Hernandez.

ASSISTANT: Ok, can you please be on hold for a while?

USER: Sure.

ASSISTANT: Sorry to intimate you that, there is no reservation found with your name to change the details.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: You are welcome. Thank you for reaching us.