You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, how can I help you?

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 I have your name please?

USER: My name is Edward Hall.

ASSISTANT: Sorry Hall, there is no reservation is found on your name.

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

ASSISTANT: Thank you and have a nice day.