You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Ruth Perez.

ASSISTANT: How may I aid you?

USER: I want to change my existing reservation, can you help me?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Thank you for waiting Ruth Perez, we haven't found any reservation under your name in our database.

USER: That's ok, no problem. It might went wrong while booking due server issues. Any way, thank you for the information.

ASSISTANT: Thank you for reaching us.