You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Wilson.

ASSISTANT: How can I assist you at this moment?

USER: Due to my health issues I would like to change my recent reservation which I have done last week to BOS. Can you help me to change my existing reservation?

ASSISTANT: Sure Jonathan Wilson, I will help you with that.

USER: Good to hear that from you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Jonathan Wilson, no reservation has found under your name to change.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.