You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my flight reservation, can you please help me?

ASSISTANT: Sure, I am mirthful to help you with that.

USER: Thank you so much.

ASSISTANT: Can you please share me your name?

USER: I am Brian Nelson.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No problem, thank you for checking.

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