You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, it is. How can I help you?

USER: I need to change my reservation which I have done to participate in dance event but unfortunately dance event got postponed. Can you help me?

ASSISTANT: yes, I am here to help you, can you provide your name to change the reservation?

USER: Thanks. Sure, my name is Jonathan Miller.

ASSISTANT: Wait a moment please, let me check the database and get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with the name Jonathan Miller in our database.

USER: Oh, it's ok no problem. Thank you for your information.

ASSISTANT: Thank you for utilising our service.

USER: Welcome.