You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation status.

USER: Karen Adams here.

ASSISTANT: Sorry, there is no reservation on your name in our database.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.