You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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 for the previous reservation? Please allow me a moment.

USER: I am Brandon Collins. Ok.

ASSISTANT: Brandon Collins, there is no reservation found under your name.

USER: No issue, Thanks for the information.

ASSISTANT: You are welcome. Thank you for contacting us.