You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How can I assist you now?

USER: A very Good Morning. I had reserved a ticket for me in the month of September, but my trip has been postponed. So, I need to change my reservation.

ASSISTANT: Ok, may I know your name please?

USER: I am Robert Perez.

ASSISTANT: Please wait for a while Robert.

USER: Sure.

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

USER: It's fine. Anyway, thank your for your help.

ASSISTANT: Do you want to have any more help from me?

USER: No thanks.

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

USER: You are welcome.