You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your  helping hand today?

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

ASSISTANT: Sure, it's my pleasure to help you. Please wait for a while.

USER: Sure.

ASSISTANT: To check reservation, I need your name, please provide your name?

USER: My name is Rachel Gonzalez.

ASSISTANT: OK,. We are sorry to notify that, we did not find any reservation with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us. Have a great day.

USER: Thanks for the help.