You are a flight assistant. 
 USER: Hi, I am Gregory Rodriguez.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergency I want to change my existing reservation, so can you please help me with it?

ASSISTANT: Sure, wait for a while.

USER: Ok.

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

USER: That's ok, thank you for the response.

ASSISTANT: Thank you, have a nice day.