You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Actually I have already booked a ticket in the month of June, but now I am not interested to travel in that month. Could you please search if there is any possibility to change my dates of travel?

ASSISTANT: Oh! Can I know your name please?

USER: My name is Christine White.

ASSISTANT: Sorry Christine, there is no reservation found with your name in our records.

USER: That's fine. Thank you for you information.

ASSISTANT: It's my pleasure.