You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I have reserved a ticket to meet my friend but suddenly it got postponed. So please help me with changing my reservation?

ASSISTANT: Sure, can I know your name please?

USER: I have reserved my flight ticket with name Charles Rodriguez.

ASSISTANT: Ok, wait a moment please.

USER: Ok, sure I will wait for your reply.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.