You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: My name is Jeffery Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: I found your reservation, can you please provide your source and destination airport codes?

USER: My airport codes are IAD and SFO.

ASSISTANT: May I know your planned travel dates please?

USER: My travelling dates are Dec 08 and Dec 10.

ASSISTANT: May I know your class and airlines preference please?

USER: I am comfortable with any flight.

ASSISTANT: Please let me know your other specifications.

USER: I need a connecting flight.

ASSISTANT: Delta airlines is providing a flight on that route with ticket fare of 200 and 1 connection, it's departure time is 12 PM and return time is 16 PM. Shall I proceed for booking?

USER:      Yes, please.

ASSISTANT: I have successfully booked you an economy class ticket in flight-1000, have a safe journey.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.