You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to modify my travelling details because my planned trip got postponed. Can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Janet Rodriguez.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry Janet, there is no reservation found with your name to change.

USER: Ok, no problem. Thank you for your valuable information.

ASSISTANT: You are welcome. Thank you for contacting us.