You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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, will you please provide your name?

USER: My name is Sarah Clark.

ASSISTANT: Can you please, wait for a while?

USER: Ok.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: That's ok.

ASSISTANT: Thank you for reaching our agency.

USER: Thank you.