You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Owing to an emergency, I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, I am here to help you with that changing reservation.

USER: Thank you.

ASSISTANT: Can you please let me know your name to check the previous reservation status?

USER: Amy Martin here.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: Thank you.

ASSISTANT: There is no reservation found on your name in our reservation list to change.

USER: Ok, no problem. Thank you.

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