You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Thomas Perez, travelling from Denver to IAH, due to small business meeting regarding school reopening. Can you help to book a flight with price of 5000?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 09/18 to 09/20.

ASSISTANT: Do you have any connection limit?

USER: No, there is nothing to specify.

ASSISTANT: Sorry to tell that there are no flights found based on your requirements.

USER: Ok.

ASSISTANT: Thank you for approaching us.

USER: Thanks for providing your valuable information.