You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to change my reservation due to sudden health issue, can you please help me out with that?

ASSISTANT: Sure, I will help you with that. Can I know your name to check for the reservation status?

USER: Thank you for accepting my request, I have reserved on the name of Emma Hill.

ASSISTANT: Ok, please wait a moment I will check.

USER: Sure, take your time.

ASSISTANT: Thank you fro waiting, sorry as per your concern I can not change your reservation because there is no reservation found on your name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: My pleasure, thank you for choosing our agency.

USER: Welcome.