You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Actually, I want to change my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, I will help you in changing the reservation. May I know your name please?

USER: I am Patrick Lopez.

ASSISTANT: Happy to inform you, I have found the reservation. Can I know your travelling dates please?

USER: My trip dates are May 24 to May 26.

ASSISTANT: May I know your airport codes please?

USER: My source is IAD and destination is PHL.

ASSISTANT: Do you need any specifications?

USER: I prefer a normal-cost airline in economy class.

ASSISTANT: Can I know your preferences?

USER: I need above mentioned preferences.

ASSISTANT: There is a flight with connection 1 and price 400, can I proceed?

USER: You can reserve it.

ASSISTANT: Ok, your ticket has been booked with flight number 1006.

USER: Thank you.

ASSISTANT: Thank you for reaching us.