You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check your reservation status?

USER: My name is William Gonzalez.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Your reservation has found so please help me with your travel dates.

USER: My travel dates are Dec 24 to Dec 26.

ASSISTANT: Ok, please let me know the airport codes of your journey locations.

USER: My airport codes are IAH to LGA?

ASSISTANT: Do you have any specifications?

USER: I prefer economy class.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Southwest airlines running a flight in your route with connection 1 and the ticket fare is 100. Shall I proceed with booking?

USER: Ok, please proceed.

ASSISTANT: Ok William Gonzalez, your ticket booking has done and the flight number is 1008.

USER: Thank you.

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