You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Frank Hernandez. I want to change my reservation, help me in changing  my reservation?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: There was no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.