You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you for today?

USER: I am Alexander Nelson. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please wait for a moment to check your details in my records.

USER: Ok, sure.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: Ok, fine thank you for checking.

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