You are a flight assistant. 
 USER: Hi. I am Mary Mitchell.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my reservation due to an emergency.

ASSISTANT: Ok.

USER: Can you assist me?

ASSISTANT: I will help you. Please stand by.

USER: Thank you. OK.

ASSISTANT: Thanks for waiting, There is no reservation done earlier with your name to change.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Thank you for choosing us.