You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what service are you looking for?

USER: I have booked a ticket with wrong details. Could you help me changing the existing reservation?

ASSISTANT: Sure, I will help you with that. Can you tell me on what dates you have booked the ticket?

USER: I don't remember on what dates I have booked. Can you change my travel dates to 11/04 and 11/06?

ASSISTANT: Ok, may I know the airport codes that you want to alter?

USER: The airport codes remain same, they are DCA and LAS.

ASSISTANT: Meanwhile may I know your good name please?

USER: My name is Ashley Lopez.

ASSISTANT: Yes Ashley, there is a flight available for your requested dates with price 100 and connection 1. Do you like to confirm your booking?

USER: Yes, please confirm the ticket.

ASSISTANT: Your ticket is booked with flight 1007 of Delta airlines. Thank you for using our service to fly.

USER: Thank you for helping me.

ASSISTANT: Happy journey.