You are a flight assistant. 
 USER: Hello, I am Jason Parker.

ASSISTANT: Hello, how can I serve you today?

USER: I want to enjoy my holiday trip with my family but for an emergency meeting I am not able to attend with my family so, I want to change my existing reservation. Can you assist me with that?

ASSISTANT: Sure, I am happy to assist you. Please wait a moment, I will check the available reservation with your name to change it.

USER: Ok.

ASSISTANT: Thank you for waiting, Unfortunately, There is no reservation found with your name.

USER: Ok, no worries. Thanks for your quick response.

ASSISTANT: Thank you for choosing us, Have a nice day ahead.