You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: I am Ryan Evans. Can you please help me in flight ticket modification process?

ASSISTANT: Just a moment please.

USER: Sure, I can wait for your response.

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

USER: Ok, no problem with that one. Thank you for your immediate help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.