You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I serve you the best today?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Virginia Baker.

ASSISTANT: Just wait for a while.

USER: Sure, I will wait.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you.