You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I render you today?

USER: Please book a ticket from Houston, TX-IAH to Los Angeles, CA-LAX, for sports event.

ASSISTANT: Sure, can you please mention your price limit?

USER: Price limit is 200.

ASSISTANT: May I know on which dates you prefer to travel?

USER: Departure is on 02/15 and 02/17 is my return date.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We did not find any flights matching your details.

USER: Thanks.