You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can you please provide the name on which you have done the reservation previously?

USER: My name is Anthony Martin.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.