You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Nelson.

ASSISTANT: How can I aid you today?

USER: Could you help me in change in existing reservation? Because my movie shoot was postponed due to bad climate.

ASSISTANT: Sure, please wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found on your name.

USER: Thank you for sharing the information.

ASSISTANT: thank you for reaching us.