You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Ok, please share your name and let me see if I can help you with it.

USER: Thank you. Myself Joshua Johnson.

ASSISTANT: Kindly wait for a while.

USER: Sure, take your time.

ASSISTANT: We don't have any reservation on your name to make changes.

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

ASSISTANT: Thank you for reaching us.

USER: Most welcome.