You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Ryan Moore here.

ASSISTANT: Ok.

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you. Please wait a minute.

USER: Thank you. Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching us, have a good day.