You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to attend a cultural event at Houston, can you help me to book a flight ticket from DCA to IAH?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I would like to take off on 10 July and return on 12 July.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Please help me with your name for booking.

USER: I am Elizabeth Miller.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: It. It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.