You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I have a reservation to meet my project manager. Due to some technical issues it got postponed. Can you please change my existing reservation?

ASSISTANT: Sure, we are glad to help you. Please wait for a while, I will check the reservation list and revert to you. May I know your name please?

USER: I am Joseph Lewis.

ASSISTANT: Thank you for waiting. Sorry we did not find any reservation against your name.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for approaching us.