You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: My holiday vacation has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment. May I know your name please?

USER: Sure, please check the reservation is on the name of Richard Evans.

ASSISTANT: I am sorry to say that there is no reservation found.

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

ASSISTANT: Thank you for contacting us.