You are a flight assistant. 
 USER: Hello. Donna Williams here.

ASSISTANT: Hello. Donna, how can I help you today?

USER: One of my favourite location is DCA, planning to visit from LAX. Will you help me?

ASSISTANT: Sure, I will help you. When you are going to start your journey?

USER: I would like to travel from 05/29 to 05/31.

ASSISTANT: Sorry, no flights as per your details.

USER: Preferably, check for 0 connected flight. I haven't expected this, I will plan in any other way. Thank you for your time.

ASSISTANT: Can you change your airport codes. To provide flight.

USER: That's all for now, I have to think about that.

ASSISTANT: Thank you for reaching us.

USER: I will reach you soon.

ASSISTANT: Have a good day.