You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Jonathan Hernandez here. Due to some reasons my business trip was postponed, so I need to change my reservation. Will you please help me with that?

ASSISTANT: Sure, I will help you. Please give me a moment.

USER: Sure.

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

USER: It's ok. No problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your help.