You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Charles Thomas. Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: On whose name you want me to check the details?

USER: Charles Thomas.

ASSISTANT: Ok, just wait a moment I will check and revert to you with the status.

USER: Sure.

ASSISTANT: Charles, we have tried a lot but we couldn't found any reservation found on your name.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for choosing our service.