You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Brian Phillips.

ASSISTANT: Brian, how can I help you today?

USER: I am planning to attend National Art museum at New York, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you with booking, may I know your airport codes?

USER: My source airport code is IAH and the destination airport code is EWR.

ASSISTANT: Please share your travelling dates?

USER: Sure, I would like to take off on 01/25 and return back on 01/27.

ASSISTANT: Sorry Brian, no flights as per your details.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: My pleasure, have a great day.