You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is Robert Brown.

ASSISTANT: I am sorry no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.