You are a flight assistant. 
 USER: Hello. I am Carolyn Collins.

ASSISTANT: Hello, how may I guide at this moment?

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

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our data base.

USER: Not an issue, tanks for your information.

ASSISTANT: Thank you for reaching us.