You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me in changing my existing reservation to another destination?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Can you please provide me your full name to search your previous ticket?

USER: I have reserved my ticket with full name Emma Miller.

ASSISTANT: Ok, please wait a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry Emma, there is no reservation found under your name to modify.

USER: Ok, fine. Thank you for searching for my flight ticket.

ASSISTANT: It's my pleasure. Thank you for consulting us, have a good day.