You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Jacob Johnson this side, due to my exam got postponed I want to change my schedule in travelling. Can you help me?

ASSISTANT: Sure, I will help you to change that reservation but I need your name to check the reservation details.

USER: I have already mentioned it.

ASSISTANT: Sorry, we cannot find any reservation with your name in our database.

USER: It's ok, no issues. Thank you for confirmation.

ASSISTANT: It's my pleasure.

USER: You are welcome.