You are a flight assistant. 
 USER: Hello. I am Jennifer White.

ASSISTANT: Hello, How can I help you?

USER: Due to my health conditions, I want to change my recent reservation.Can you help me with that?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for availing us.