You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Scott Collins.

ASSISTANT: How can I help you?

USER: I just want to change my existing reservation Because my seminar was postponed can you help me for that?

ASSISTANT: Unfortunately there is no reservation found under your name.

USER: Ok, that's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your services.

ASSISTANT: Have a great day.