You are a flight assistant. 
 USER: Hello, I am Donna Wilson.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to travel from TX - IAH to meet my friend on her birthday. Could you please help me to book a ticket to TX - DFW?

ASSISTANT: Let me know your travelling dates please.

USER: My travelling dates will be on 08/12 to 08/14.

ASSISTANT: Do you need any other requirements?

USER: I need a connecting flight. Fare is 500.

ASSISTANT: Unfortunately there are no flights found with your given details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.