You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am willing to change my recent reservation because my business trip got postponed. Can you help me in modifying my ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your good name please?

USER: I have reserved my previous ticket with name Brandon Brown, so please check my ticket with this name.

ASSISTANT: Ok, please wait for few minutes, I will check with your existing reservation.

USER: Sure, take your own time.

ASSISTANT: Thank you for your time, there is no existing reservation found on your name in our data base.

USER: It's ok, I think the ticket might not be reserved properly before.

ASSISTANT: Ok, sorry for the inconvenience caused. Thank you for reaching us, have a great day ahead.

USER: It's ok, thank you for the information.