You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Davis from Boston.

ASSISTANT: Karen, how can I assist you at this moment?

USER: I need your help in altering my existing reservation to New York. Can you please help me with this?

ASSISTANT: Sure, please give me a minute.

USER: Sure, take your own time.

ASSISTANT: Karen, there is no reservation found with your details.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for contacting us.