You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Could you please help me with changing my recent reservation?

ASSISTANT: Sure, I will help you. Please provide the name on which booking has been done.

USER: My reservation was done under the name Ryan Lopez.

ASSISTANT: I have found your reservation, may I know your new travelling dates?

USER: I would like to depart on Jan 31st and return on Feb 2nd.

ASSISTANT: May I know your source and destination airport codes respectively?

USER: My source airport code is IAD and destination airport code is DFW.

ASSISTANT: Do you have any class or connection preferences?

USER: I need a connecting flight.

ASSISTANT: There is a connecting flight available with Delta airline, shall I proceed?

USER: Yes, please confirm the booking.

ASSISTANT: Your booking is confirmed with the flight number 1026. Happy journey.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: You are welcome.