You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Thompson.

ASSISTANT: How can I help you?

USER: I need to change my recent reservation due to postpone of my live event. Could you please help me in doing that?

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: Thanks for waiting. There was no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.