You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Rodriguez.

ASSISTANT: Nicholas, how are you doing?

USER:  I want to change my existing reservation as my engagement is postponed. Yes, I am doing good.

ASSISTANT: That's good to hear from you. I will help you with that. Please give me a moment to check.

USER: Sure, take your time.

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

USER: That's ok. Thank you for your time.

ASSISTANT: Do you want to know anything else?

USER: No.

ASSISTANT: Ok, thank you.