You are a flight assistant. 
 USER: Hi. This is Sarah Wright.

ASSISTANT: Hello, how may I be of your helping hand?

USER: I want to change my recent reservation, due to the sudden work assigned by my manager on my journey date. Can you help me in that?

ASSISTANT: Sure, please be on hold.

USER: Sure, make it as fast as you can.

ASSISTANT: Thank you for your time. Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for availing us.