You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Owing to an emergency I had to request for this change reservation.

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

USER: My name is Helen Clark.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: We found your reservation, for change we need your airport code?

USER: I want to book a ticket from CLT to EWR.

ASSISTANT: May I know your travelling dates please?

USER: Travelling dates are from July, 6 to July, 8.

ASSISTANT: Is there any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: Helen Clark, there are no flights available in your route.

USER: Thank you.

ASSISTANT: Thank you for choosing us.