You are a flight assistant. 
 USER: Hello. I am Benjamin Phillips.

ASSISTANT: Hello, what help you are looking for?

USER: I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me?

ASSISTANT: Sure, can you please be on hold for a while? Sorry Phillips, no reservation found on your name.

USER: Oh! May be I am wrong. Anyway, thank you for your information.

ASSISTANT: Thank you for reaching us.