You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Eric Evans here.

ASSISTANT: How can I aid you today?

USER: Can you change my flight ticket reservation? As my travel dates for my business trip in Chicago has been changed.

ASSISTANT: Sure, I will assist you.

USER: Ok.

ASSISTANT: Sorry to say this, no reservation found under your name in our records.

USER: That is not a problem. Thank you.

ASSISTANT: Thank you for opting us.