You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Nancy Hill.

ASSISTANT: Ok.

USER: I am planning to visit Hoh Rain forest in Washington with my friends, could you book a connecting flight?

ASSISTANT: Sure. May I know your airport codes?

USER: My source is Orlando, MCO and destination is IAD.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I would like to leave on 11/27 and arrive on 11/29.

ASSISTANT: How much can afford for your flight ticket?

USER: I can afford up to 500.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you.