You are a flight assistant. 
 USER: Hi, myself Lisa Williams.

ASSISTANT: Hello, how may I aid you?

USER: I would like to meet my grandfather at Dallas, could you please help me to book my flight ticket from LGA to DFW?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, I want to take-off on 09/01 and return back on 09/03.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: AA airlines is available in your route with the ticket fare of 300, shall I proceed with the booking?

USER: No, I can only afford 200.

ASSISTANT: Let me check with that.

USER: Sure.

ASSISTANT: Lisa Williams, there are no flights available in your route with that price.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.