You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation due to heavy rains. Can you help me for that one?

ASSISTANT: Sure, we are here to help you. Can I have your name to proceed further?

USER: Sure, Jason Miller here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We found a reservation on your name, kindly share your new airport codes?

USER: My airport codes are ORD and DTW.

ASSISTANT: May I know when you are willing to travel?

USER: My planned travel dates are 05/15 and 05/17.

ASSISTANT: Are you looking for any preferred connections?

USER: I want a flight with single connection.

ASSISTANT: Do you have any other specifications to be met?

USER: No more, thank you.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no issues, thank you for the information.

ASSISTANT: Thank you for opting us.