You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gary Martin here.

ASSISTANT: How may I assist you today?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation,.

ASSISTANT: Ok, please wait foe a moment, let me check your previous reservation status.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: I have found your previous reservation with your name. Can you please provide your new preferable airport codes?

USER: My airport codes will be IAD to IAH.

ASSISTANT: May I know your new travelling dates, please?

USER: My trip dates will be 09/05 to 09/07.

ASSISTANT: There is a connecting flight in Frontier airline and the ticket price is 100. Shall I proceed with booking?

USER: Please proceed further.

ASSISTANT: Your booing has been done with the flight-1013.

USER: Thank you for your help.

ASSISTANT: Gary Martin, thank you for approaching our agency. Have a safe journey.