You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to bad weather conditions in Phoenix, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, May I know your name?

USER: Yes, my name is Paul Robinson.

ASSISTANT: We are glad to inform, we found a reservation with your name. Kindly mention your new airport codes?

USER: Sure, my new airport codes are PHX and LAS.

ASSISTANT: Please provide me your travel dates?

USER: Sure, I would like to travel on dates 12/22 and 12/24.

ASSISTANT: Sorry to inform no flight found with your given details.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you.