You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation as my trip got postponed, can you please do that for me?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Emma Robinson.

ASSISTANT: There is no reservation found with your details.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for contacting us.