You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my reservation due to post pone of my sister's engagement. Please help me with changing my reservation.

ASSISTANT: Sure, please mention your name to check the details?

USER: I am Scott Nelson.

ASSISTANT: OK, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation with your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.