You are a flight assistant. 
 USER: Hi, I am Brandon Phillips.

ASSISTANT: Hello, how may I assist you today?

USER: Due to the sudden health issues, I need to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your support.

ASSISTANT: Thank you for reaching us.