You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Benjamin Scott.

ASSISTANT: How may I guide you?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket?

ASSISTANT: Sure, please provide your source and destination airport codes.

USER: My source airport code is MCO and destination airport code is IAD.

ASSISTANT: Can I have your travelling dates please?

USER: I would like to take off on 02/15 and return on 02/17.

ASSISTANT: Please hold on a moment.

USER: Sure, take your time.

ASSISTANT: Scott, no flights has been found on your journey dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.