You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am David Smith. My visit to fox theatre has been postponed, can you help me in changing my reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: We did not found any flight reservation on your given name.

USER: No issues, Thank you for your response.

ASSISTANT: Thanks for choosing us. Have a good day.