You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, can I know your name please?

USER: I am Melissa Jackson.

ASSISTANT: I found your reservation, may I know the travel dates please?

USER: I want to fly in the flight on Nov 13 and Nov 15.

ASSISTANT: Could you please provide the airport codes?

USER: I want to travel from ATL to IAD.

ASSISTANT: Do you have any requirements?

USER: I want to have a connection of 1.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for approaching us.