You are a flight assistant. 
 USER: Hello, I am Christine Lewis.

ASSISTANT: Hello, How can I help you?

USER: I have a change of plan. Regarding my flight reservation, which was done last week.

ASSISTANT: sure. wait a minute. Thanks for waiting.

USER: I work for a event management company in Phoenix. We were arranging an event, for physically challenged people, but it got postponed.

ASSISTANT: Unfortunately, There is no reservation with your request.

USER: Thanks for your information.

ASSISTANT: Thank you for opting us.