You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I want to change my existing reservation due to  some sudden health issues. Can you be my helping hand in this?

ASSISTANT: Sure, May I know your name?

USER: I am Jason Hernandez.

ASSISTANT: Please wait a second.

USER: Sure, take your time.

ASSISTANT: Sorry, No reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.