You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Carol Roberts, want to alter my reservation dates. Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment. Thank you for your valuable time, sorry, no reservation found on your name.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for availing us.