You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how can I assist you?

USER: I am Ryan Jackson. I want to reschedule my existing resevation, can you help me?

ASSISTANT: Ok, please wait.

USER: Take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.