You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Alexander Taylor here. Can you please help me out with altering my previous reservation now?

ASSISTANT: Sure, give me a minute.

USER: Thank you.

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

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.