You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Melissa Harris. I am planning for trip with my family to DFW, can you help me with booking ticket from HOU?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Ok, my trip dates are from 09/02 to 09/04.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a flight with normal-cost.

ASSISTANT: Sorry to say, there are no flights available for your desired airlines.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.