You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have planned for a trip, but it is postponed due to some reasons. Can you please help me to change the existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Frank Campbell.

ASSISTANT: Thank you for providing your details, there is no reservation with your requirements.

USER: That's ok, thank you for the information.

ASSISTANT: You are welcome.