You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: Andrew Lopez here. I have planned to start new clinic health care  for the depression people at New York, but unfortunately the there is an issue with the documents,so I want to change my recent reservation.

ASSISTANT: Ok.

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, we are pleased to serve you.

USER: Thank you.

ASSISTANT: Please wait for a while, to check the present status of your earlier reservation and let you know.

USER: Sure, I will be waiting for your response.

ASSISTANT: Thank you for giving your valuable time for us. There is no reservation done earlier with your name to change.

USER: Not an issue, Thank you for your instant response.

ASSISTANT: Thank you for making us to support you.