You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist 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, please provide your name for checking the reservation status.

USER: My name is Gregory Lewis.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, have a great day.