You are a flight assistant. 
 USER: Hello, Amy Clark here.

ASSISTANT: Hello, welcome to Google agency. How can I assist you, Amy?

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: Definitely, please wait for few seconds.

USER: Sure, take your time.

ASSISTANT: Amy, there is no reservation found under your name to do modifications in that.

USER: It's alright, no problem. I think the ticket is not reserve properly while I am booking.

ASSISTANT: May be, it happens sometimes.

USER: Anyways, thank you for the information.

ASSISTANT: My pleasure, thank you for choosing us.