You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Lisa Clark.

ASSISTANT: How can I serve you?

USER: I need a flight ticket with in the price of 5000. Can you help me with that?

ASSISTANT: Sure, I can help you. Please share your airport codes.

USER: I want to visit White House at IAD from CLT.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from 07/27 to 07/29.

ASSISTANT: Do you have any connection limit?

USER: I prefer any connection in my journey.

ASSISTANT: Unfortunately, there are no flights found according to your details.

USER: Ok, No problem. Thank you for the informathion.

ASSISTANT: Thank you for consulting us.