You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Lewis.

ASSISTANT: How can I help you?

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: Yes, I am happy to help you with  that. Can you please wait a minute?

USER: Thank you for considering my request and I can wait for your response.

ASSISTANT: Sorry to inform you, there is no reservation found with your name to change the details.

USER: That's fine. Now I got some clarity about my reservation, thank you so much for your help.

ASSISTANT: You are most welcome. Thank you for reaching us and hope you reach us in future.

USER: Welcome.