You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my reservation as I have booked my ticket with wrong dates, please help me out.

ASSISTANT: Ok, can you help me with your name?

USER: I am Ryan Walker.

ASSISTANT: Please wait until I get back you.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation with your name.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.