You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary King.

ASSISTANT: How may I assist you?

USER: I need a direct flight to travel from IAD to DFW. Can you help me in finding?

ASSISTANT: Can you please share me your travel dates?

USER: I need to reach by 04/28 and return on 04/30 as I have an match in between these dates.

ASSISTANT: Do you have any specification?

USER: Yes, I need a direct flight with price under 500.

ASSISTANT: There is no direct flight on your details.

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

ASSISTANT: Thank you so much for choosing us.