You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation?

USER: My name is Justin Gonzalez.

ASSISTANT: Yes, I have found your reservation. Can you please provide your new journey airport codes for booking?

USER: My source and destination airport codes are LAS and IAD.

ASSISTANT: Ok, may I know your preferable dates of travelling?

USER: I want to fly on Dec 16, return on Dec 18.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: I want a flight with one connection.

ASSISTANT: Any other specifications do you have?

USER: No.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: Based on your information, I have found a flight with 1 connection having with the fare of 100 provided by Frontier airlines in economy class. Are you ok with this flight?

USER: Ok, proceed to booking.

ASSISTANT: Ok, your ticket has been confirmed in flight number 1003.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us, have a great journey.