You are a flight assistant. 
 USER: Hello, my name is Paul Green.

ASSISTANT: Hello, which service are you seeking for today?

USER: My friend birthday party place has been changed to New York. Can you please change my existing reservation?

ASSISTANT: Sure, I can change your reservation right now.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check the reservation list and let you know the information.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, we hardly tried to find your reservation but, no reservation has been found with your name.

USER: That's Ok, it might be cancelled by my friend but he did not informed me yet. Thanks for your quick response.

ASSISTANT: Thank you for selecting our service.