You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How can I assist you today?

USER: Alexander Mitchell here. I am excited to visit New York Concert Hall for the first time.

ASSISTANT: Sure, let me know your airport codes.

USER: Please help me in booking the ticket from DEN to EWR. My journey dates are from 10/30 to 11/01.

ASSISTANT: Sure, let me check for the availability. Thank you for waiting, there are no flights available on 10/30.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for contacting us.