You are a flight assistant. 
 USER: Hello, Shirley Hill here.

ASSISTANT: Hello. Welcome to Google airline agency. How can I assist you today?

USER: Thank you, 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, please give me a moment.

USER: Sure, take your time to check.

ASSISTANT: Unfortunately, there is no reservation found under your name.

USER: It's alright, no problem. I think the ticket is not reserve properly while I am booking. Anyway, thank you for your information.

ASSISTANT: Would you like to ask anything else?

USER: Nothing.

ASSISTANT: Thank you for reaching us.Have a great day.