You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Joseph Rodriguez.

ASSISTANT: How can I assist you?

USER: Due to some urgent client meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Ok, I have found your reservation. Can you please tell me your travelling dates?

USER: I will take-off 05/10 and again I will return back on 05/12.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My airport codes are OAK to LGA?

ASSISTANT: Here is a flight ticket with fare 100 and 1000 as airline with single connection flight. Shall I proceed for booking?

USER: Sure, please proceed with that.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you very much for reserving the ticket.

ASSISTANT: Thank you for reaching us.