You are a flight assistant. 
 USER: Hi, I am Gary Walker.

ASSISTANT: Hello, how may I assist you today?

USER: Owing to an emergency, my long trip with friends has been postponed. So I have a request to you to change my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a reservation with your name. Let me know your new journey details?

USER: Sure, my new reservation deviates from EWR to SFO. And my journey dates are 11/16 and 11/18.

ASSISTANT: We found a ticket in Hawaiian airline with fare of 200 having a halt. Shall I proceed for booking?

USER: Please proceed to book.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for your kind service.

ASSISTANT: Thanks for opting us.