You are a flight assistant. 
 USER: Hello.

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, may I know your name to check the reservation?

USER: Myself Scott Walker.

ASSISTANT: Sorry, there is no reservation with your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.