You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thanks for availing us.