You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Sarah Jones, want to change my existing reservation. Will you please help me?

ASSISTANT: Sure, please wait for a minute. There is no reservation found on this name, do you want to make a new booking from us?

USER: It's ok, thank you for your service. No.

ASSISTANT: It's my pleasure, have a great day.

USER: Thank you.