You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Debra Thompson. My holiday trip has been postponed, so I would like to change my existing reservation. Could you please help me with that?

ASSISTANT: Wait, give me a moment.

USER: Sure.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us.