You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: Can you please help me to modify my previous reservation?

ASSISTANT: Sure, please share your good name?

USER: Sure, I am Cynthia Walker.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Sure, my trip dates are on Jan 17th to 19th.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I prefer it.

ASSISTANT: Which airports do you prefer to start and land on?

USER: My airport codes are AUS - IAD.

ASSISTANT: Do you have any other specifications?

USER: I prefer a business class to go.

ASSISTANT: Thank you for your details, there are no flights found with the given class.

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.