You are a flight assistant. 
 USER: Hello. I am Richard Brown.

ASSISTANT: Hello, how can I assist you today?

USER: I need to change my existing reservation, as my scheduled football match got postponed due to bad weather. Will you help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: We are glad to say that, we found a reservation on your good name.

USER: Ok.

ASSISTANT: Please share me your journey dates.

USER: My new journey dates are 09/07 and 09/09.

ASSISTANT: May I know your source and destination codes?

USER: I will leave from DFW to reach ATL.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: It's ok. Thank you.

ASSISTANT: Thank you for opting us.