You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Virginia Moore here.

ASSISTANT: I found your reservation. Please help me with your travelling dates to change your reservation.

USER: July, 7 and July, 9 are my travel dates.

ASSISTANT: Could you share your airport codes?

USER: LAS and IAD are my airport codes.

ASSISTANT: Do you have any specifications?

USER: I need connecting flight.

ASSISTANT: There are no flights available on your routes to change.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.