You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Andrew Allen. Due to bad weather, I am planning to alter my reservation. Can you help me?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

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

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.