You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Paul Johnson. I have an invitation from NASA Space center regarding meeting on a new project, can you please help me with booking a connecting flight?

ASSISTANT: Sure, I am ravish to help you. Let me know your selected airport codes.

USER: I will leave from OAK airport to reach IAH.

ASSISTANT: How much you can afford for this journey?

USER: I can pay up to 200.

ASSISTANT: Could you please share your travelling dates?

USER: Sure, I need to go on 02/03 and I will come back on 02/05.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thank you for being patience, there were no flights found on your route.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing us.