You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Thompson.

ASSISTANT: How can I assist you Emma?

USER: Due to my health problem I want to change my reservation, can you please help me that?

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

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you so much for reaching us, have a great day.