You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jessica Phillips. I want to change my existing reservation, due to some health issue. Can you please help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Wait for some time.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thanks for choosing.