You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: Jennifer Williams here.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Fine. Thank you for your prompt service.

ASSISTANT: Thank you for opting us.