You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Melissa Miller here. I need to meet my twin sister in New York, so please book a ticket for me from CLT to EWR.

ASSISTANT: Can you please provide your travelling dates?

USER: Sure, my trip dates are from 08/13 to 08/15.

ASSISTANT: Melissa Miller, there are no flights available on this route due to heavy bookings.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you so much for your help.