You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I can help you in ticket modification. May I know your name for checking purpose?

USER: Myself Gary King.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: I have checked based on your request it is showing that there is no reservation found for the user name to modify your booking.

USER: No problem, thanks for checking.

ASSISTANT: You are most welcome and thank you for reaching our agency.