You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you today?

USER: I am Pamela Anderson. Please, change my existing reservation as my planned trip has been postponed to some other dates.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: Fine, thank you for help.

ASSISTANT: Thank you for reaching us.