You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I assist you the day?

USER: I want to change my existing reservation due to health problem. Can you please assist me with this?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: On what name do I need to check the reservation?

USER: Reservation was done under the name of Emma King.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: We regret that, there is no active reservation found on your name to change it.

USER: That's ok, not an issue. Thanks for your kind help.

ASSISTANT: Thanks for reaching us.