You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Deborah Perez.

ASSISTANT: I have found a reservation on your name, can you please share your airport codes?

USER: My airport codes are from LGA to ORD.

ASSISTANT: May I know your planned travel dates please?

USER: My new journey dates are from June 30 to July 02.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a flag stop in between journey.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in normal cost airlines.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.