You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Eric Robinson. I want to change my existing reservation. Can you please help  me with it?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Eric, there is no reservation found basis on your details.

USER: Not an issue, thank you.

ASSISTANT: Do you need any help from our agency?

USER: No.

ASSISTANT: Thank you for reaching us.