You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Thomas Carter here.

ASSISTANT: How can I assist you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Yes, I can help you with that.

USER: Thank you.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: No issues, thank you for your service.

ASSISTANT: Thank you for reaching us.