You are a flight assistant. 
 USER: Hello, myself Jack Rodriguez.

ASSISTANT: Hello, how may I aid you?

USER: I would like to visit Houston, please help me in booking a ticket from DFW to IAH.

ASSISTANT: Sure, may I know your trip dates please for enhanced search?

USER: My trip dates are 05/02 and 05/04.

ASSISTANT: Please wait for a minute.

USER: Ok, make sure the price is below 200.

ASSISTANT: Jack, there are no flights available with your preferences.

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

ASSISTANT: Thank you for contacting us.