You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Pamela Hernandez. I am planning to travel on these days that is on 09/14 and return on 09/27. Can you find a flight ticket for me?

ASSISTANT: Sure, May I know your airport codes please?

USER: Ok, my airport codes are from IAD to OAK.

ASSISTANT: Is there any specifications?

USER: Yes, I want to change my return date is on 09/16.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Delta airlines is available in your route with the ticket fare of 100, shall I proceed with the booking?

USER: You can proceed with the ticket booking.

ASSISTANT: Your ticket is booked with the flight-1023.

USER: Thank you for your valuable time.

ASSISTANT: Thank you for reaching us.