You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Virginia Lewis.

ASSISTANT: Wait a  while, kindly.

USER: Sure.

ASSISTANT: We found a reservation in your name. Can I have your airport codes?

USER: My airport codes are from IAH to ORD.

ASSISTANT: Help me with the trip dates?

USER: My trip dates are on Feb 25 and Mar 01.

ASSISTANT: Do you have any preferences?

USER: I need to depart in the evening time. I prefer a single connecting flight.

ASSISTANT: Please re-check your dates once and let me know.

USER: My depart date is on Feb 28.

ASSISTANT: Sorry, no flights were running in your desired routes.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.