You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Debra Garcia.

ASSISTANT: Ok, Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name, please provide me your travelling dates.

USER: My new trip dates are Mar 01-03.

ASSISTANT: Can I know your airport codes?

USER: My travelling is from SFO to ORD.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you.