You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Timothy Thomas. I want to change my recent ticket booking due to office work that my manager did not approved my leaves, so can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting we found reservations on your name.

USER: Ok.

ASSISTANT: Can you share me your new journey details?

USER: Sure, my source airport is Las Vegas, NV - LAS and destination airport is Boston, MA - BOS. My journey dates are 02/07 and 02/09.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: We found Spirit airline with connecting flight and number 1000 fare of 100. Shall I proceed for booking?

USER: You can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thanks for choosing us.