You are a flight assistant. 
 USER: Hi. I am Eric Lopez.

ASSISTANT: Hello, how best I can assist you?

USER: I want to change my reservation as my plan to go for a adventure trip got postponed. Can you help me?

ASSISTANT: Sure, I will help you. Please wait a moment I will check  your reservation and get back to you.

USER: Ok.

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

USER: It's Ok.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your response.