You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Jack Thoms here, I need to do some modifications in my ticket, can you please help me? My name is Jack Thomas.

ASSISTANT: Sure, wait for a moment.

USER: Ok.

ASSISTANT: Sorry Jack, no reservation found on your name.

USER: No issues, thank you for your clarification.

ASSISTANT: Thank you for contacting  us.