You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nicole Collins here.

ASSISTANT: How can I help you today?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Ok.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: That is not a problem. Thank you.

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