You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Virginia Perez.

ASSISTANT: Nice meeting you Perez.

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

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: That's not a problem. Thank you.

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