You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Please mention your name for checking the reservation.

USER: Sure, myself Thomas Wilson.

ASSISTANT: Please give me a moment. Thanks for waiting, there is no reservation found under your name.

USER: It's ok fine, no problem. Thank you for your time.

ASSISTANT: Welcome, have a great day.