You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I want to change my reservation. Can you help me with that?

ASSISTANT: Sure, I here to help you.

USER: Thank you.

ASSISTANT: May I know your name for checking with previous reservation status?

USER: Sure, Brandon Thomas here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no reservation found under your name to change.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.