You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Melissa Hill, help me to book a flight on 06/26 and return ticket on 06/28 to visit Washington for vacation.

ASSISTANT: Sure, may I know your journey codes please?

USER: I will fly from TX-HOU to DC-DCA.

ASSISTANT: Ok, do you need any connection in between the journey?

USER: I need a connecting flight.

ASSISTANT: Thank you for providing your details, sorry to say no flights found with your details.

USER: Ok, thank you for the information.

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