You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Williams.

ASSISTANT: How may I assist you at this moment?

USER: Suddenly I got a call from my project manager to attend the meeting on the same departure date, so I am looking to change my travel dates. Can you please help me in changing the details?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure, please go ahead with your search.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

USER: No issues with that one, now I got some clarity about the ticket. Thank you for your information.

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

USER: Welcome.