You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Jones.

ASSISTANT: How can I assist you today?

USER: I would like to change my previous flight ticket booking due to some health problems, so can you please help me in my flight ticket changing process?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Thank you for accepting my request and I can wait for your response.

ASSISTANT: Andrew Jones, there is no reservation found under your name to do modifications in that.

USER: Ok, that's fine. Thank you for your quick response and providing the information.

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

USER: Welcome.