You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, can I have your name please?

USER: My name is Timothy Thomas.

ASSISTANT: Thank you, we found a reservation on your name, please share your new trip dates?

USER: I will fly on Sept 07 and return on Sept 09.

ASSISTANT: Please share your airport codes?

USER: My source point is DCA and my destination is LAX.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Sorry, Timothy Thomas, no flights found with your given new dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.