You are a flight assistant. 
 USER: Hello, I am Ryan Walker.

ASSISTANT: Hello, how can I aid you?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me in this/.

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation on your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.