You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Rodriguez.

ASSISTANT: How can I assist you?

USER: I want to change my existing reservation. Can you please help with that?

ASSISTANT: Sure, I can help you with that. Please wait for some time while I'll check your reservation status.

USER: Sure.

ASSISTANT: Robert, I found your reservation in our data base. Can you please provide me your airport codes?

USER: Ok, my airport codes are LAX and SFO respectively.

ASSISTANT: Ok, may I know your travel dates please?

USER: Ok, my travel dates are 06/20 and 06/22.

ASSISTANT: Ok, please wait for a while.

USER: Ok take yourown time.

ASSISTANT: Spirit airlines is having a flight on that route with travel charge of 100, shall I proceed for booking?

USER: Ok, proceed with that.

ASSISTANT: I have successfully booked your ticket with flight-1024, have a safe journey.

USER: Thank you for your consult.

ASSISTANT: Thank you for choosing us.