You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I want to change my existing reservation as my meeting with my lawyer is postponed. Please help me with that.

ASSISTANT: Sure, may I know your name for the changing process?

USER: Ok, Emma Clark is my name.

ASSISTANT: Please standby.

USER: OK.

ASSISTANT: Thank you for your time, we did not find any reservation in your name in the data list.

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Thank you for opting us. Hope to serve you again.