You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help do you need from us?

USER: I have to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I will help you with that. Can I know your name please?

USER: Thank you. Please check the reservation with my name Michael Johnson.

ASSISTANT: Ok, please give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no active reservation found with your name to change the details.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: You are welcome. Thank you for choosing us.