You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, we are glad to help you. Could you please provide your name to check your previous reservation status?

USER: My name is Lisa Martin.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Thank you for waiting. We did not find any reservation with your name.

USER: oK, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us. Have a good day.