You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to change an existing reservation as my interview got postpone due to some technical issues. Can you help me with this?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Can you share me your name for checking?

USER: I am Joshua Perez.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.