You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to an emergency, I would like to change my previous flight ticket. Can you please help me in that one?

ASSISTANT: Ok, may I know your name to check your reservation status?

USER: Thank you and my name is David Carter.

ASSISTANT: I found your reservation with your name, can I have your travel dates?

USER: Sure, my travel dates are May, 26th and 28th.

ASSISTANT: Fine, let me know your airport codes too.

USER: Sure, my airport codes are SEA and MCO.

ASSISTANT:  What is your fare estimate for this booking?

USER: I can afford up to 5000.

ASSISTANT: As per the details, there is a connecting flight-1026 with price 300. Shall I book it?

USER: Yes, you can book it.

ASSISTANT: Ok, booking is done on AA airlines.

USER: Thank you for changing my flight ticket booking in quick manner.

ASSISTANT: Welcome, have a good day.