You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Ryan King, as my trip to go for vacation got postponed I need your help in changing my earlier reservation.

ASSISTANT: Sure, I'll help you with this.

USER: Thank you.

ASSISTANT: Wait a moment please, let me check your reservation status.

USER: Ok.

ASSISTANT: Ryan King, there is no reservation found with your name in our database to change it.

USER: It's ok. Thank you.

ASSISTANT: Thank you for contacting us.