You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Catherine Martinez.

ASSISTANT: How can I help you?

USER: I am planning to travel from IAH to OAK for a business trip. Can you please help me with booking a flight ticket?

ASSISTANT: Please provide me your travelling dates?

USER: Sure, my departure date is on 01/15 and the return date is on 01/17. Please make sure that the price limit should not exceed 200.

ASSISTANT: Ok Martinez, wait a moment.

USER: Sure.

ASSISTANT: As per your request, no flights found for you.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you.