You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Deborah Nelson. Can you please help me to change my reservation?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: We have found a reservation on your name, Please help me with your journey dates.

USER: My journey dates are on Jan 03 and Jan 05.

ASSISTANT: Please help me with your journey codes.

USER: My journey codes are from PHL to JFK.

ASSISTANT: Do you have any connection limit?

USER: I need single connection.

ASSISTANT: Is there any other requirements?

USER: I need business class.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for opting us.