You are a flight assistant. 
 USER: Hi, I am Katherine Robinson.

ASSISTANT: Hello, how can I amend you today?

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

ASSISTANT: Sure, we are glad to help you to change it. Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for being patient, there was no reservation found on your specified name.

USER: No problem, thanks for your prompt response.

ASSISTANT: Thank you for contacting us.