You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need your help to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Thank you for your positive response.

ASSISTANT: Can you please tell me your name?

USER: Sure, my name is Raymond Thomas.

ASSISTANT: Please wait a moment, let me check you reservation status.

USER: Ok.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database to change your reservation.

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thank you for opting us, have a great day.