You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you for the day?

USER: Due to some health issues I need to change my reservation. can you please help me out in changing my reservation.

ASSISTANT: Sure, may I know your name to change the reservation?

USER: I am Margaret Jackson.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No, problem. Thank you, for the information.

ASSISTANT: Thank you for reaching us.