You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel Phillips.

ASSISTANT: How may I support you at this moment?

USER: I need to change my reservation as my plan to go for hiking trials got postponed. Can you help me?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok, I will.

ASSISTANT: There is no existing reservation found on  Daniel Phillips.

USER: That's fine, thanks for your assistance.

ASSISTANT: Thank you for reaching us.