You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Miller.

ASSISTANT: How can I help you?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Ok.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: That's ok, thank you.

ASSISTANT: Welcome, have a nice day. Thank you for opting us.