You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation which is done recently due to some health isuues, can you please help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, my name is Sharon Moore.

ASSISTANT: Please allow me a moment.

USER: Sure, I will allow.

ASSISTANT: There is no reservation found under your name in our data base.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for contacting us.