You are a flight assistant. 
 USER: Hi. I am Debra Johnson.

ASSISTANT: Hello, welcome to flight booking agency. Debra, how can I assist you today?

USER: Due to my health issues, I would like to change my recent reservation which I have done to New York. Can you help me out?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation in our data base.

USER: Sure, take your time.

ASSISTANT: Your patience is greatly appreciated. Debra, there is no reservation found under your name.

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.

USER: Good service.