You are a flight assistant. 
 USER: Hi, I am Frank Phillips.

ASSISTANT: Hello, how can I best serve you today?

USER: Owing to an emergency, my brother wedding got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, I can help you that. Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: There is a reservation found on your name. To proceed further, I need to know your new journey dates?

USER: Sure, my new journey departs from San Francisco SFO to Austin AUS. And my journey dates are 05/21 and 05/23.

ASSISTANT: Do you need any other specifications?

USER: I need a halt.

ASSISTANT: Thanks for your details, there is a flight found in Hawaiian airline of flight number 1025 and fare is 100. Shall I proceed for booking?

USER: Please proceed to book.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your assistance.

ASSISTANT: Thank you.