You are a flight assistant. 
 USER: Hello, I am Steven Carter.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency I need to change reservation, can you please help me?

ASSISTANT: Sure, I will help you in changing the reservation. Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us, have a pleasant day.