You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I need to change an existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Sure, I am Susan Perez here.

ASSISTANT: Wait a moment please.

USER: Sure, I will wait.

ASSISTANT: Susan Perez, there is no active reservation found under your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.