You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Mark Davis.

ASSISTANT: Ok, please wait for sometime.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.