You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency, I want to change my existing reservation. Will you help me in changing?

ASSISTANT: Sure, may I know your name please?

USER: My name is William Brown.

ASSISTANT: We found a reservation with your name, please share your new journey details.

USER: Sure. My source is Oakland, CA - OAK. My destination airport is Houston, TX - IAH.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are 04/08 and 04/10.

ASSISTANT: We found a Frontier airline, flight number: 1004, price: 100 with one connection.

USER: Ok, you can proceed.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.