You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Anna Wright from Los Angeles.

ASSISTANT: Yes, Anna.

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 with that?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok, thank you.

ASSISTANT: Sorry Anna, I did not find any reservation under your name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: It's my pleasure.