You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you at this moment?

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

ASSISTANT: Sure, may I know your good name please?

USER: Thank you for that. Please check the reservation with my name Gregory Brown.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure, take your time.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.