You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Due to an emergence, I want to change my existing reservation. Can you help me it?

ASSISTANT: Sure. To check for your existing reservation, can I have your name?

USER: My name is Helen Young.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing our service.

USER: Thanks for the help.