You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Phillips.

ASSISTANT: How may I help you?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: That's ok, no probelm. Thank you.

ASSISTANT: Thank you.