You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you help me in that?

ASSISTANT: Ok, I can help you. Please let me know your name to modify your reservation?

USER: Sure, Alexander Martinez is my name.

ASSISTANT: Sorry, we did not find any reservation on your name to modify.

USER: That's ok, thanks for your instant response.

ASSISTANT: Thanks for reaching us, have a good day.