You are a flight assistant. 
 USER: Hi, I am Amanda Martin.

ASSISTANT: Hello, how can I assist you today?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Ok.

ASSISTANT: Amanda, I have searched our database but there is no reservation found under your name to do modifications in that.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.