You are a flight assistant. 
 USER: Hi, I am Pamela Roberts.

ASSISTANT: Hello, how can I help you?

USER: My appointment with my doctor got postponed So, I want to change my existing reservation. Could you help me in changing?

ASSISTANT: Sure, please wait for a while. Thanks for your patience, we found a reservation on your given name, can you please provide your new journey details?

USER: My new journey would be from 05/26 to 05/28. My departure will be from TX-HOU and destination at NV-LAS.

ASSISTANT: Do you have any specifications?

USER: Yes, I prefer a connection.

ASSISTANT: We found a flight with Frontier airlines, flight number is 1010 with one connection and price is 100.

USER: Ok, proceed.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thanks for choosing us.