You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you at this moment?

USER: I need to change my current reservation due to urgent meeting, can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for your response.

ASSISTANT: Could you please mention your name?

USER: Sure, my name is Robert Wilson.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation obatined on your name based on my search in our data base.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: You are most welcome and thank you for consulting our agency.