You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Elizabeth Hill. Can you please change my existing reservation as my planned holiday trip got postponed due to bad weather?

ASSISTANT: Sure, let me go through the reservation list and revert you.

USER: Ok, I will wait for your response.

ASSISTANT: We could not find any active reservation by the name you provided.

USER: It's ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for approaching us.