You are a flight assistant. 
 USER: Hi. George Martinez here.

ASSISTANT: Hello George. How can I assist you?

USER: I want to book a ticket from PHL to DFW, to see my parents.

ASSISTANT: That's nice. Can you provide me travelling dates?

USER: I would like to travel on 03/30 and 04/01. Price should be within 200.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found matching your requirement. Sorry for the inconvenience.

USER: It's ok. Thank you.

ASSISTANT: You are welcome.