You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this?

ASSISTANT: Sure, can you provide me your name please?

USER: My name is Michelle Allen.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Michelle Allen. I regret to inform that there is no reservation by your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.