You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Sure, my name is John Evans.

ASSISTANT: Thank you. Please wait, let me check your reservation status.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: You are welcome and thank you for choosing us.