You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sharon Jones want to change my reservation due to prepone of my meeting. Can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a while.

USER:  Ok.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER:  Thank you for your response.