You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am very busy with my meetings, so I am not able to complete my trip. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, we are here to help you. Can you please share your name.

USER: I have reserved my flight ticket with name Jonathan King.

ASSISTANT: Please wait a moment.

USER: Ok, sure I will wait for your response.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, thank you for checking.

ASSISTANT: Thanks for reaching us.