You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: My name is Nicholas Lee.

ASSISTANT: Please, standby.

USER: Sure.

ASSISTANT: Thank you for being patience. There is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.